Glock double feed

[TheProf]

Ok...

Just breaking in my new G26.
First trip........100% of 100 rounds.
2nd trip to the range.........out of 150 rounds, I had one double feed and one stove pipe.

Now...mind you, I'm use to my G27 (.40 cal).

So...I'm wondering...what causes "double -feeds"?

I was using WWB...fmj.

 

[Diggers]

Perhaps a mag issue? Hard to say why something like that happens on occasion. If it was a regular thing it would be easier to figure out.

I'm curious...why did you get a 26 when you already had a 27?

I'm thinking about getting a 27 so I'm seeking input.

 

[TheProf]

I was using low recoil SD ammo on the 27. After some thought...I realized that the ballistics for the .40 ammo I was using was very similar to a 9mm +P. I went with the 26 for less recoil (faster follow up shots) and 1 more round capability.

Anyways, with regards to the double feed...could it be caused by the ammo not being powerful enough? It was WWB... (When I was using my .40, I was using federal ammo instead of the Winchester White Box that I was using for the 9mm.)

I also noticed that the gun was extremely dirty after only firing 100 or so rounds...much dirtier than my G27 firing Remington ammo.

Have others noticed the same thing?

 

[SpaceFrank]

I've never had a problem with WWB, but if the gun's getting dirtier faster than with other ammunition, maybe you got a dirty batch. If I'm not mistaken, stovepiping is the result of the slide not cycling fully, which can be blamed on a light powder load or maybe limp-wristing. I don't know exactly what double-feed means.

 

[M1key]

How many times has it done this? Once or twice? I would run a five hundred rounds through the pistol and then reevaluate...

Your Glock is designed for for Nato pressure, +P ammo. Sometimes problems can occur with Glocks when using U.S. bulk-pack stuff, because a lot of it is manufactured as cheaply as possible and is often underpowered.

WWB is fine for practice and should be adequate for competition.




M

 

[possum]

op,
the number one cause of malfunctions in any semi auto handgun is the magazine. when i see double feed the first thing i would look at is the magazine.

stove pipes are normally caused by either an incefficent amount of powder in the cartridge or limp wristing is the most common factor that I have seen in people using stock guns and factory ammo. people using lightly loaded reloads is a different story, and generally they just need to add a little powder charge and the gun would cycle 100%

it is possible that the wwb had a light round in the lot i suppose. if you know that you were not limp wristing and you know that you were doing everything right then i would say the ammo is the cause there.

It could also be a recoil spring issue, but if the gun is brand new this shouldn't be an issue. glock factory recoil srpings are good for 5,000rds.

 

[M1key]

Glock 9mm service life is more like 40,000 rounds, at a minimum. In practice, 80,000 rounds with no maintenance.


M

 

[possum]

Glock 9mm service life is more like 40,000 rounds, at a minimum. In practice, 80,000 rounds with no maintenance.

if this was a response to my post, i said that the recoil spring assembly last 5k rounds, can it last longer? sure, however it is recommended to be replaced every 5,000rds. as far as service life of a glock 9mm handgun, it is much longer than 80,000rds. there are a few instructors in the training community with over 100,000rds through theirs.

 

[The Lone Haranguer]

A double feed is a failure to extract the fired case from the chamber. (This is different from a failure to eject.) Suspect the extractor. It may be "gunked up" or frozen in its channel, the spring that forces the claw inward may be worn out or broken, the claw damaged or missing, etc.

 

[M1key]

As an armorer and an instructor, I am aware what the pistol is capable of...

I won't think a NEW G26 would have an issue with the recoil spring, unless it is too stiff. Ergo, run 500 rounds through it, and evaluate.


M

 

[gofastman]

I was using low recoil SD ammo on the 27. After some thought...I realized that the ballistics for the .40 ammo I was using was very similar to a 9mm +P. I went with the 26 for less recoil (faster follow up shots) and 1 more round capability.

good choice

For whatever reason, WWB in 9mm has a smaller rim groove on it than other ammo, making it harder for the extractor to grab on to. My keltec PF9 would absolutely not play nice with WWB but was 100% with any other ammo.

I really think a Glock should feed anything, but a couple of problems with that ammo in the first 200 rounds of operation isn't an issue IMHO, if it continues to have problems after that, even one, I would ship it back to Glock for a repair.

crappy camera phone pic, hopefully you can see what I'm talking about.
WWB on the left, Federal HST on the right:

 

[LiveLife]

It's been my experience and observation that failure to extract spent cases fully and stove piped cases are from slide not being pushed all the way back.

As several posted, this is due to insufficient charge of lighter factory target loads or reloads, especially for the lighter 115 gr bullet. This problem is worse for subcompact Gen3 Glocks and Gen4 Glocks with stiffer double recoil spring sets.

Prof, the reason why you didn't experience this problem with your G27 is because the heavier 40S&W bullets/loads exert more rearward momentum on the slide, so this is less of a problem for 40 caliber Glocks. If you were experiencing problem with the 115 gr ammo, switching to heavier 124/5 gr ammo should help with the cycling problem.

 

[KBintheSLC]

I am not sure why the ammo would be the issue here, unless you got a bad batch. I have run piles of 115g WWB through my G26 without a hitch. I used a case of it for a class a while back where I ran about 400-500 rounds per day for two days without a single failure of any kind. Actually, the G26 is probably one of the least ammo-sensitive guns I have ever owned.

Double feeds tend to be caused by extraction/ejection failures. Take a good close look at your extractor, and how it engages a spent case. Does it positively lock onto the rim? Also look at your ejector and make sure it is not damaged.

..

 

[LiveLife]

I am not sure why the ammo would be the issue here

OP:
Anyways, with regards to the double feed...could it be caused by the ammo not being powerful enough? It was WWB... (When I was using my .40, I was using federal ammo instead of the Winchester White Box that I was using for the 9mm.)

It is the ejector (not the extractor) that pushes on the base of the spent case to pop the case out after the extractor pulls the case out of the chamber. The spent case base will contact the ejector only towards the final 1/4 inch of the cycling of the slide.

If the rearward travel of the slide and the speed of the recoiling slide is insufficient, the spent case rim will be held by the extractor as the slide moves forward and when the spent case neck hits the ramp, it will stove pipe/jam or rechamber the spent case (if the recoil is very light).

If the slide moved back enough for the front of the rib at the bottom of the slide to catch the next round in the magazine, as the slide moves forward, the spent case will ride up the breach face as the mag spring tension will push the stripped round up and cause stove pipe/jam as the next round's nose bumps on the feed ramp.

OP:
I also noticed that the gun was extremely dirty after only firing 100 or so rounds...much dirtier than my G27 firing Remington ammo.

Limp wristing and lighter charge load are usually the cause of this problem and I am ruling out limp wristing as the OP did not experience problem with the previous range session.

I would recommend a good cleaning and firmer two hand grip with locked elbows on the next range session. You could also try the heavier 124/5 gr ammunition as I have seen this problem more with the lighter 115 gr ammo.

 

[M1key]

....................

 

[M1key]

The ammo may very well cause problems as well stated above. Here is a comment by DannyR of Glocktalk. He is an armorer and coach for the Glock Shooting Sports Foundation and has done extensive research on current U.S. manufactured ammo:

http://glocktalk.com/forums/showpost.php?p=15902507&postcount=20

Over the years, several U.S. ammo manufacturers have reduced the power level of their cheaper lines in order to squeeze out more profit dollars. That is a sad fact. You must accept that not all 115-gr ammo is created equally. Manufacturer's specs prove that point beyond question.

Glock 9mm pistols have been designed for NATO ammo since day one. Minimum ammo velocities used to be published in the Glock Armorer's manual. The year 2000 manual calls for a minimum of 1,180fps from 115-gr and 1,148fps from 124-gr. Remington UMC, Blazer, Federal Champion and PMC fall far below those minimums. Most European choices meet or exceed NATO spec.

By the way, the original Gen1 G17's cam with 18# recoil springs, but Glock had to change that to 17# because of the US Market in 1986.

I am posting a copy of my research once again. Bottom of the list is the lowest powered ammo. Should Glocks run on anything? No! Should BMW's and Shelby Mustangs run on regular gas? No. Why is UMC, Blazer and Champion so cheap?

Brand Weight Velocity Power Factor
Fiocchi 124 1180 146.32
Fiocchi 147 1000 147.00
Fiocchi 158 940 148.52
Am Eagle 147 1000 147.00
Win RA9124N NATO 124 1185 146.94
RWS Sport FMJ 124 1181 146.44
S&B 124 1181 146.44
Rem. Express 147 990 145.53
Magtech 147 990 145.53
UMC 147 990 145.53
Lawman 147 985 144.80
Prvi Partizan 147 984 144.65
S&B 115 1250 143.75
Fiocchi 115 1250 143.75
Am Eagle 124 1150 142.60
Glock Minimum* 124 1148 142.35
Win USA 124 1140 141.36
Blazer 147 950 139.65
Lawman 115 1200 138.00
PMC Bronze 124 1110 137.64
Magtech 124 1109 137.52
Win USA 115 1190 136.85
Rem. Express 124 1100 136.40
UMC 124 1100 136.40
Am Eagle 115 1180 135.70
Glock Minimum* 115 1180 135.70
Blazer 124 1090 135.16
Blazer Brass 124 1090 135.16
Lawman 124 1090 135.16
Cor-Bon match 147 900 132.30
My Reloads 147 900 132.30
PMC Bronze 115 1150 132.25
Prvi Partizan 115 1148 132.02
Blazer 115 1145 131.68
Blazer Brass 115 1145 131.68
Rem. Express 115 1135 130.53
Magtech 115 1135 130.53
UMC 115 1135 130.53
Federal Champ 115 1125 129.38

*2000 Glock Armorer's manual
__________________
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Certified Glock Armorer 1997, 2000, 2003, 2006, 2009

 

[Glocked N Loaded]

I'm with some of the other folks on here in terms of it being an extractor issue when your g26 double fed. But, since you had a round fail to eject also it could be an ammo issue in both cases. I am not an expert, but was wondering since the double feed only happened once, could the lip on the round that was not extracted be the cause? Just thinking alound. Either way, I bet it will be hundreds, if not thousands of rounds before it happens again in your G26. Also, congrats on the new purchase, I have been wanting one for a while now.