I'm just curious, as I'm looking at the mil-spec primers....Has anyone ever experienced a SOFT PRIMER INDUCED slamfire in their AR or M1A? Not hearing of someone, or seeing someone, but had it happen to you? I've never used the mil-spec primers, and never had a slam fire. I'm wondering how common this occurrence is. Thanks!-
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December 23, 2012, 12:16 PM
I've never had one in either of my AR's, or either of my M1A's, and I pretty much have used Winchester rifle primers in all of them.
When I was in the Marine Corps from 1965 to 1971, my rifle was an M14. I never saw a slamfire with one in all those years.
I'm not saying it can't happen, just that I've never had one, nor seen one.
Hope this helps.
December 23, 2012, 12:21 PM
Navy small arms instructor. Lots of ammo down range. Not once. I have seen the rapid disassembly of both the M9 and M16 due to a squib load. None on M14s or M240.
December 23, 2012, 12:24 PM
No, never did.
December 23, 2012, 12:42 PM
One slamfire with my AR using Win primers so I steered away from them for about 3000 rounds using Rem 6 1/2 without incident. Then I read that 6 1/2s were not for 5.56mm so I used up the rest of my brick of Win small rifle primers without further problem before going to Rem 7 1/2s.
I use Win or Rem 7 1/2s interchangeably without worrying too much about slamfires anymore.
December 23, 2012, 01:15 PM
I had a bunch of them early in my reloading of the .223.
The problem turned out to be, I wasn't getting all the primer crimp out of the GI cases.
So I was smashing primers in with a Rockchucker press primer seater arm.
That flattened them badly.
And they would slam-fire.
After I got a crimp swaging set-up, and a RCBS had priming tool with some "feel" I could tell if I had a problem and do something about it.
Never another slam-fire in the last 40 years.
Using standard CCI & Winchester primers.
December 23, 2012, 01:16 PM
Must not be too common, as I've fired tens of thousands of my reloads through my ARs, and I've only used standard small rifle primers.
December 23, 2012, 01:43 PM
My AR15 slamfire occurred during the NRA standing slowfire stage of a highpower match. I was using the brass colored WSR primers. Winchester nickle primers used to be the primer I preferred to use, never had an issue, but these brass colored WSR are thin and pierce easy. My AR also slamfired, in battery.
The bud with whom I was squadded, his AR slamfired with a Federal primer, during his standing relay. I talked to him this year, he had another with a Federal primer and has stopped using those primers and like me, we lower the bolt partially with the charging handle when shooting standing. In the rapid fire sequences I no longer toss my sighting rounds in the chamber and hit the bolt release, now I drop the magazine each shot and put those rounds in the magazine, one at a time.
What characterizes the standing stage from all other stages is that the rifle is loaded single shot while standing. (That you shoot the standing stage while standing ought to be obvious from the name.) However because you are standing, most people lower the muzzle, drop the round in the chamber, and hit the bolt release while the muzzle is down. Enough slamfires occur standing that it has become evident that the little extra bolt acceleration due to gravity is enough to set off the occasional primer.
The NRA banned loading on the stool. I used to see shooters balancing their muzzles on their shooting stool, drop a round, hit the bolt release. I heard of AR’s slamfiring through the stool and that has to be why it is now illegal to load on the stool. I can just imagine the consternation on the line when some poor schmuck blew out the bottom of his shooting stool with all his equipment inside. I hope no one shot their foot. A 223 round in the foot would cause a nasty wound.
I use CCI #41 primers as they have thick cups and are hard to pierce. These are excellent primers in the AR and I shoot HM scores (seldom HM standing scores anymore) all the way out to 600 yards with the things.
And do not assume for an instant that you won't have a slamfire. When you load these things, you must ensure that nothing is in line with your muzzle that you don't want dead. Just in case.
Slamfires happened to the early M16’s because of a heavy firing pin and sensitive primers. If you look in Chapter eight, page 130, of the “Black Rifle” by R. Blake Stevens, there is an entire section on the slamfire problems the Army had with the M16. A number of AR15 slamfire incidents had occurred when cartridges were single loaded and the bolt release pressed.
If you read the report in the book, dated 1963, based on the tests of two rifles with the firing pin configuration available at the time, the energy during bolt closure of one of the test rifles firing pin always was above the “none fire” specifications of the primer. Which meant that statistically some of the primers would ignite at those energy levels. So the Army did two things. The first was to test alternate firing pin configurations, all pictured in the book, and one has a spring undoubtedly like the current AR-10 design, and the second was to change the ammunition specifications to require a harder primer.
If you are interested in reading more about the early M16 slamfire issues go to http://www.dtic.mil/dtic/ and type in “Report of the M16 Rifle Review Panel. Volume 5, Appendix 4. Ammunition Development Program”. Read the other reports. These documents were classified as part of the Army coverup of the problems with the M16 program. We are fortunate that they were retained long enough to be posted to the internet.
What you will find in that declassified report is a discussion of the sensitivity of primer mixes. There is a common assumption that a primer is a primer is a primer. This is false.
USAF and USMC testing of the AR-15 indicate a "slam-fire" problem. The issue is originally blamed on high primers, but this is quickly dismissed as the cause.
At Frankford Arsenal, William C. Davis issues "First Memo Report on AR-15 Rifle Ammunition Systems: Investigation of Firing Pin Energy and Primer Sensitivity." The kinetic energy of the existing AR-15 firing pin is found to range from 4 to 14 inch-ounces when the bolt closes. While Frankford does not currently have equipment to determine the sensitivity limits of .223 primers, they have been told by Remington that it should be comparable to military .30 Carbine primers. Primers for military .30 Carbine cartridges have "None Fire/All Fire" tolerances of 6 to 36 inch-ounces. Davis recommends that the None Fire limit for .223 ammunition should exceed 15 inch-ounces.
Frankford personnel submit study to TCC regarding primer sensitivity level versus risk of slam-fires:
None Fire - All Fire limits Risk of Slam-Fire
16-64 in-oz 1 In 10 million
12-60 in-oz (Current sensitivity limit for 7.62mm NATO) 1 in 160
12-48 in-oz 1 in 6,400
14-56 in-oz 1 in 11,000
Occured today while breaking in a new upper ... single round in the mag, pressed the release and ... BANG! A little later on, with three rounds in the mag, pressed the trigger ... round fired. Everything is ok. Pressed the trigger again ... double BANG!
I went back to single loading to finish out the box. Total rounds fired ... 40. Two slam-fires (including the double). Two failures to extract. One failure to feed.
First slam-fire was on the second round fired (while I was still single loading the magazines). The double was on rounds 27, 28 (of 40).
At this point the ammunition is my prime suspect, Winchester "White Box" .223 Rem, 62 grain but I would have to say that ARs do, in fact, slam-fire.
I did inspect for a frozen pin after the first slam fire. I didn't expect one (frozen pin) since I had personally cleaned and inspected the gun last night and it was the second round of the day. I also didn't expect it to foul up too much since it is a piston operated upper (ZM Weapons).
The upper was brand new and unfired (except for factory). The lower is a relatively new (about 200 rounds) RRA. Both (upper and lower) were cleaned, inspected and lubricated properly before the trip to the range. The lower has functioned flawlessly for those 200 rounds when mated to a White Oak Armament upper (all Black Hills .223 Rem 77 grain).
I know BR said that the bolt face could cause the slam fire but the two casings did have firing pin strikes with no other dimples or scratches on the primer face.
I am begining to suspect the recoil spring on the ZM upper. It does seem rather robust. This upper might require the harder primers found in 5.56 NATO. Unfortunately I don't know it all yet so I'm still researching.
Tavor 21 Slamfire video on youtube.
Notice how many rounds the guy fires. If he had a mechanical problem he would have recurring slamfires, but he did not. When you see the slamfire, notice that the finger is not on the trigger. He was running Federal American Eagle (federal primers) and Winchester ammo. Winchester redesigned their primers in 1999 to make them more sensitive.
Watched an AR Slam-Fire Saturday
Posted 20 http://www.usrifleteams.com/forums/index.php?showtopic=13132&view=&hl=slamfire&fromsearch=1 April 2009 - 09:10 AM
I was scoring my firing-point partner Saturday during offhand and he had a slam-fire on about the 5th round. We're talking about an experienced shooter here. Multi-year state HP champion, generally shoots 199-clean offhand, not to mention he's a hell of a nice guy. The bullet hit the dirt about 10 yards in front of the firing line. I was watching him closely trying to learn something from his technique, but didn't expect to learn this. I know his finger was off the trigger for certain but his muzzle was decidedly pointed earthward when he closed the bolt. The area downrange is uninhabited for many miles, so at this range folks are a bit lax about closing the bolt while rifle is pointed toward the impact area. After that, he was pretty careful about keeping it level. He was shooting an AR spacegun. He thought it might have been due to the bolt carrier weight he had just put in for testing before this match. My suspicion is high primer, but he could be right. Another possibility is his loading technique. He places the round through the ejection port, then tips the muzzle down and jiggles the round fully into the chamber prior to closing the bolt. I have always thought it best to leave the cartridge on top of the magazine and let the bolt "strip" and chamber it from it's "natural" position. In any event, let this be a lesson to all of us. Closing the bolt is an inherently risky event. Point yer rifle at the backstop when you push that button. My buddy lost the match as a result of his slam-fire, but next time it could be a lot worse.
Posted 30 May 2009 - 08:09 AM
I am the person Heman referred to having a slam fire on a bolt rifle. The rifle in question is a Stolle BB Panda action with a Kelbly trigger set at 14 oz. The system is two years old and has several thousand live rounds through it as well as countless dry fires. After the match, I re-weighed the trigger and it still breaks at 14 oz. The only thing that was found was a very small piece of dirt on the sear engagement notch, but I doubt that this was the cause of the slam fire. I tried to re-create the condition 8-10 time on the line, without success, then again at home. I KNOW I didn't have my finger on the trigger when I closed the bolt, so that scenario isn't a suspect either. I just returned from a two day Palma style match where I fired over 100 rounds and not a single hick-up with the system. I guess it will just get chalked up to one of life’s great mysteries.
I have had ARs fire unintentionally before when the bolt hold-open is released and the bolt slams home. Usually this has happened with reloads, due to use of soft commercial primers and the free-floating firing pin design of the weapon. The milspec primers are slightly harder to prevent just such events. Many claim that the low wieght of the alloy pin makes this unlikely,...but I've experienced it and know better. Nearly took my big toe off once when I releoaded a fresh mag and let the bolt fly home (finger off the trigger, of course).
If the weapon had seen a lot of rounds fired since the last cleaning, the carbon fouling build up that the direct gas system is notorious for could have slowed the rotating and closing of the bolt just enough, that when the sudden slowing of the bolt assembly's forward movent allowed the free-floating firing pin to hit forward on the soft commercial primer,...detonation occurred before complete locking of the breach.
Posted 20 April 2009 - 10:43 AM
It's happened to me.
I've found that dropping the round entirely into the chamber and letting the bolt close with full momentum isn't the best idea.
I now leave the round resting on the magazine and let the bolt "pick it up" as it closes.
Free-floating firing pins and occasionally sensitive primers can lead to this.
Gary brings up a good point about the trigger issue. Another consideration is the primer. I have seen 2 slamfires in an AR15. Both occured during an offhand string, 2 shots in a row. The shooter is a very experienced reloader and highpower shooter. It never happened again to him. He was using WSR primers. Perhaps it was the primer's "sensitivity," a couple of high primers, or a combo of the two.
The occurance sure did shake his nerves though. Both rounds impacted 10-20 yds in front of the firing line.
Posted 20 April 2009 - 12:02 PM
I had it a few years ago practicing off hand with winchester white box in my service rifle.
Second shot of the night, shot went into the ground in front of me. I put the rifle down and tracked down my 2 ejected brass. Looking at the primer strikes, one had metal flow out into the firing pin hole in the front of the bolt. So, instead of a primer srike like an innie belly button, one of the brass had an outie. No damage to the rifle.
Whats most amazing about your post PamF is the 199 to 200 part!
Posted 20 April 2009 - 12:46 PM
I've had two slam fires and both of them scared the beejiminees outta me. One of the more experienced shooters in my club made the observation that slams seem to happen more often when the muzzle is depresseed as the bolt goes forward. He postulated that the firing pin is already lying forward from gravity almost as if it was preloaded. He figured that as the bolt rode forward with the pin already out, if the primer was gonna go that just gave it the extra opportunity to do so. Since that time I've never let the bolt go forward with the muzzle depressed. I have no idea whether his idea has any merit but it makes me feel safer. For what that's worth. LOL
Posted 22 April 2009 - 11:06 AM
We had at least 2 MIA's over the years at New Holland that had rounds go off when the bolt was closed.
The reason I am able to think of at least 2 is the severe damage to the rifles. In the 2 listed instances the rifles were damaged to the point the receivers were cracked and or broken.
We have an AR-15 do the same thing a time or 2 a year. We have not had rifle damage from the AR-15 slam fires.
My finding at the end of the M1A era and start of the AR-15 era was to completely ensure an AR-15 will not slam fire is to install a light weight firing pin.
Posted 22 April 2009 - 12:31 PM
I had a slam fire several months ago. I was just at my regular local club's range doing slow fire standing practice. Put the round in the ejection port, sort of tipped my rifle forward very quickly to let inertia start the round in the chamber and dropped the bolt. Round went off about 10 feet in front of me. I make an effort to keep the rifle parallel to the ground when dropping the bolt, but get lax about it sometimes.
I was using handloads. Hornady 75gr HPBT, 24.0gr RL15, Remington 7-1/2, LC03 brass. I'm betting the primer was a bit high, because it was once fired brass from military source and I used a Dillon Super Swage tool to just barely swage the pockets (keeping them tight as possible, but still accept a primer).
Posted 23 April 2009 - 01:58 PM
I g=had a slam fire with a Garand in the first highpower match I EVER shot. Really unnerved my. I was a reloading greenhorn, but others found some issue with the dies a friend had loaned me. learned a lot that day. I've always remembered that.
Posted 03 May 2009 - 08:52 AM
We've had only one instance in the 11 years I've ran local matches. AR15, handload. The same gun has been used many times since w/o any problems. The round impacted the ground 15 feet in front of the line - not a big problem with me compared to having the muzzle raised and the bullet leaving the range.
Me, guess like most, load with the muzzle slightly depressed, drop it in, and hit the bolt release. Bent several rounds trying to drop 'em on the follower. Haven't lost 10 points to slamfire yet, although I have employ many other methods of losing points !
Posted 29 May 2009 - 11:46 AM
I saw two slam fires by the same shooter in the same offhand string.
He was a good shooter who posted a poor score for the day because of this.
I never found out what caused this in his rifle that day but it reinforced the absolute importance of having the muzzle ALWAYS pointed in a safe direction when closing the bolt on live ammunition. (in any firearm)
Both rounds impacted the ground a few yards ahead of him but later, in the same match, I witnessed him closing his bolt with the muzzle well above the horizon. ????????
Bullets impacting the ground will tumble and have a limited flight distance but ones angled above the horizon can pose a much more serious hazard.
Trying to close the bolt with the rifle aimed at the backstop is, in my opinion, asking for trouble. I always keep my muzzle down when closing the bolt and have never experienced a slam fire in my own firearms.
Most folks close their bolts sky high during their rapids and I wish that they wouldn't
Posted 29 May 2009 - 12:33 PM
I had mine to slamfire monday while chronographing some loads. It was completely horozontile on a front rest when I loaded and closed the bolt. I'm just glad it was pointed downrange and wasn't pointed at the chronograph when I closed the bolt. Scared the crap out of me though.
Slamfire, how is it scored?
Posted 21 July 2009 - 12:05 PM
How do you score or count a slamfire? Is it considered as a miss or are you allowed to fire over with another round and disreguard the slamfire? I am referring to having a slamfire while shooting slow fire 200 or 600. The reason I'm asking I have had 2 slamfires one was recorded as a miss at one range and the other one was disreguarded and I was allowed to fire another round in it's place at a different range. Just wanting to know the proper procedure. Tim
Posted 21 July 2009 - 04:05 PM
I never had this happen until I bought some CCI400 primers. The rem. 7.5 never slamfired on me. I'll be glad when the CCI's are gone.
Posted 25 July 2009 - 06:12 PM
I had it happen to me twice in the same stage of a match, standing slow fire, with the newer Winchester SR primers. I was able to borrow a friends extra amo and finish the match. I now only use Rem 71/2's at matches and have never had a problem since. The old Win SR's were harder. I have used CCI mil spec primers on my practice loads with no issues also
December 23, 2012, 02:15 PM
M16M4 or M41, never on military ammo; delt with millions of rounds of 5.56 in many different dodic
AR-15 with Winchester White Box and a few others... maybe 1 in 10k rounds. Anyone familiar with the AR platform should have noticed that it will dent the primers on the cambered round.
AK-47 with cheap US made ammo, never with foreign / surplus.
December 23, 2012, 04:33 PM
No slamfires in M16,AR180,Mini14.
December 23, 2012, 04:36 PM
I have never had a slam fire in any of my M1s, M1a, or ARs. I will not say it will never happen though.
I have read that many slam fires can be attributed to miss seated primers such as high primers, crushed primers or something similar.
i have also read that letting a bolt slam home on a round in the chamber can cause a slam fire.
For single round loading...
With my M1, I use a SLED, which feeds the round from the magazine but allows single loading.
For the ARs, I use a magazine with a single round follower in it. I place the round on the follower then let the bolt go home. I sometimes get the round started into the chamber with my finger before releasing the bolt. But based on Slamfire1's post, I may be rethinking that a little.
I have not shot the M1A enough to have arrived at a plan yet, but it looks like it needs some thought.
December 23, 2012, 05:09 PM
Slamfire FTW again.
Tagged for posterity....
December 23, 2012, 05:17 PM
If the rifle is mechanically correct, primer sensitivity is the primary cause of slamfires. While broken rifles with busted or frozen firing pins will cause slamfires, these are not subtle, and are easily detected. Murray’s Guns has a video of a mechanically defective SKS. It slamfires each time the bolt goes forward. http://www.youtube.com/watch?v=xj3QtnUWCwQ. The most puzzling slamfires and the ones that really shake you are the ones due to primer sensitivity.
Primers vary in sensitivity by brand and within brand. Primer cake is a composition of a number of chemicals, which can be varied to make the primer more or less sensitive. People who have been at primer manufacturers told me that primer cake is mixed by hand with paddles. Anything mixed that way is going to have a bit of non uniformity and even if all the chemicals are of correct strength, I don’t doubt that some of the mix is going to be a little less sensitive and some of it a little more.
Anything with a free floating firing pin is susceptible to a slamfire given that the kinetic energy of the firing pin is enough to set off the primer.
I think Mr Oldham’s M1911 drop testing is interesting in this regard. Mr Oldham varied firing pin weight and drop height, using the same primers. You can see that not all primers went off at the same height, even though some did, showing that even within the same brand, primer sensitivity varies.
Drake Oldham M1911 Drop testing
The original testing used a 9mm steel firing pin and a 9mm titanium firing pin. The firing pin hole was then reamed for a .45 sized pin and the tests were repeated with .45 sized steel and titanium firing pins. All of the firing pins were weighed prior to testing. A Wolff XP firing pin return spring was used for all of the testing. All of the cases used for testing used Winchester large pistol primers. The frame and slide were donated by Gary Smith at Caspian. The pistol was built using techniques learned from Larry Vickers and Bruce Gray. The pistol was tied to a section of 550 cord, looped over a pulley, and dropped onto common floor materials. The magazine was loaded with 8 dummy rounds to bring the pistol up to proper weight. Four floor types were selected. Concrete, Pergo, 5/8 plywood, and shag type carpeting. The thumb safety was left OFF as preliminary testing with the safety ON indicated that damage to the thumb safety, slide, and plunger tube would occur with only a few drops. The hammer frequently dropped to the half cock notch during testing.
9mm STI titanium pin 2.17 grams
9 mm Caspian steel pin 4.45 grams
45 STI titanium pin 2.36 grams
45 Colt steel pin 4.30 grams.
I was amazed at how easily a Series 70 1911 could be drop fired. Steel firing pins and concrete are a bad combination. 9mm sized pins and titanium construction will add several feet to your safe drop distance. I will be running Wolff XP springs and a Ti pin in all of my Series 70 type 1911’s.
I have attached an Excel spread sheet with the results. You will notice a lot of “Did Not Drop” entries. I saw no reason to drop test a particular combination of firing pin and flooring if it was not firing at higher distances or on harder flooring. I did several drops at various distances to get an idea of safe drop distances. This was to account for hard or sensitive primers. Each primed case was dropped only once. Just in case you were wondering, the pistol sustained significant damage. The muzzle is distorted from being dropped. I had to turn down the outside diameter of the barrel three times just to keep the slide from locking up. The muzzle, magwell, and grip safety have some serious blending in their future. Nothing sounds worse than a 1911 hitting the concrete from 10 feet!
His excel spread sheet can be found:
High primers are a red herring as it is in fact very difficult to get a high primer to go off. The anvil has to be firmly seated on something and the primer cake has to be pushed into the anvil. This can happen if there are shallow primer pockets and one guy got his ammunition to slamfire by not removing the brass donut that results after swaging the crimp from a military round. He swaged his cases and left the donuts in the bottom of the pocket and seated primers on top of that.
Today many people still follow the lead of the American Rifleman technical staff who did not acknowledge primer sensitivity as a cause of slamfires. I went through every American Rifleman magazine from the late 50's up to 2000 and primer sensitivity as a cause is only touched on briefly in Wayne Faatz’s article “The Mysterious Slamfire”. http://www.scribd.com/doc/2649554/The-Mysterious-Slamfire and the whole concept repudiated years later by a lead staff writer and retired Frankfort Arsenal Employee. In print he wrote that the idea that the Garands/M14’s might have a design defect “preposterous” . The only allowed causes of slamfires were high primers and worn out receiver bridges.
This is puzzling as their most knowledgeable Staff writers had worked for Army Ordnance, at least one of them worked at Frankfort Arsenal for decades and I have copies of letters William Davis (a NRA writer) sent out to all American Ammunition manufacturers concerning his study of primer sensitivity and the AR15. If you don’t remember, early AR15’s slamfired which resulted in the Army specifying a less sensitive primer and a lighter firing pin. These ex Frankfort Arsenal employees also went through development of the lead styphnate primer, something that was tested over years concerning issues you never thought of, including weapon system character tics and primer sensitivities. I have a couple of these reports. The lead Staff Expert at the NRA actually ran the Smalls Arms Test Division at Aberdeen after WW2 when all prototype rifles were tested (and there were lots of them) leading to the selection of the M14.
And yet with all this background in ammunition manufacture, investigations into primer initiated slamfires, they never mentioned primer sensitivity as a factor in slamfires in the Garand or M14.
I believe this was a misdirection away from those "preposterous" defects inherent in Garands/M1a’s and the AR15, all of which have free floating firing pins and all have been known to slamfire. Unfortunately the Garand/M1a will slamfire out of battery.
Civilians did not know about AR15 slamfires at the time, the mass importation of military surplus rifles with heavy free floating firing pins had not occurred. Such rifles include the Tokarev, AK47, SKS’s, MAS49/56 and you can easily find slamfire reports on them. And of course there was no internet for shooters to compare notes. The American Rifleman staff controlled the in print theoretical discussion about slamfires by only publishing dope bag articles and accounts that supported their contentions that only misconduct by shooters cause slamfires. Ed Harris was a NRA technical writer in the 80's, here in this post, it is all about your poor reloads and your out of spec rifle. Barely a nod to primer sensitivity, all this shows the mind set of the American Rifleman staff of the period. http://www.thehighroad.org/showpost.php?p=6534244&postcount=7
A lot of people have had slamfires in Garands/M1a's and have been hurt following the advice of the NRA Technical Staff.
Slamfires can and have happened with all rifle primers, and why is a long discussion, lets just say primers are not as predictable as people want them to be. People who use the most sensitive primers on the market are just increasing their chance of a slamfire.
I recommend in all mechanisms with free floating primers to slow the bolt speed down by feeding from the magazine and to use the least sensitive primers you can find.
For Garands/M1a’s it is critical to small base size cases and by the use of Wilson Type case gages, ensure that the case is sized below chamber headspace. Set the shoulder back about 0.003”.
Even though this guy used CCI #34 primers, he had a tight case. When a Garand/M1a bolt has to crunch fit a tight or long case the bolt lugs are not engaged and the free floating firing pin is unrestrained and will hit the primer at the highest velocity of bolt travel. This guy dropped a round in the chamber and released the bolt and blew the back end of his receiver off.
It is possible that had the case dropped all the way in, the slamfire would have been in battery, though given the design of these rifles, that will never be a 100% certaintly.
I had one about a year ago. Using CCI SR primer in a stock Colt 6920. Here's a pic of the lightly dimpled slam-fired case next to a normal one. The round was activated during a string of fire, as opposed to while chambering from a fresh magazine.
Whether a gun can slamfire or not, one should never let a bolt or slide slam home on a live round with the muzzle pointed in an unsafe direction. Period.
I have not had a slamfire, but I did have an AR double once. I put it away and then replaced the trigger assembly before I ever shot it again.
December 24, 2012, 01:58 AM
I personally had 3 slam-fires the same day the second time I took my M1 Garand out. Funny thing is, the ammo was Greek Surplus that came from CMP.
I ordered the "RifleSservice Pak" set of springs from Wolff Gunsprings (http://www.gunsprings.com/index.cfm?page=items&cID=2&mID=88#504) and the problem never showed itself again. I usually use CCI#34 primers but when they were unavailable I did use CCI200 and Winchester LRP without any slam-fires. I feel if the springs are in good condition there's less a chance of slam-fires. (all 4 springs)
December 24, 2012, 11:46 AM
It appears that 'SlamFire1' has thoroughly researched and reported on the subject. Excellent info sir.
As for me, no I have never had a 'slam fire' ever, in any weapon.
I do find the little dimples some times on primers after a round has been chambered and extracted, M1&M1A, none detected in any AR based weapon that I recall.
Many, too many, years ago I was told of a "Hang fire / slam fire" from a 1911A1 Colt. I was not around at the time to see the weapon or brass, so I can only go by hear say. (My opinion is still in reserve on this - a 230gr hardball slug punched threw some 3/8s quarter round and crack sheet glass at the edge and stopped! All at point blank range. Something was not right with this. I can only imagine the excitement in the booking area:eek:) But I digress...
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