Pls help troubleshoot failure to feed in XM15

[Tirod]

There is almost nothing wrong with too much lube, other than the operators reluctance to have it spray their face. Most soldier's who run their weapon dry simply didn't want to clean a messy weapon.

And yet the TM requires the upper channel and certain parts to be "wet," i.e., enough lube to push around with your finger. If new, use more.

It's counter intuitive, but running wet actually keeps the gun CLEANER, as the lube captures the gas residue, keeps if from sticking to metal parts, and can be wiped off. Then add more new lube. It is far superior to scraping baked on carbon.

Unless you live in the Artic, or shoot only in a duststorm, extreme conditions are NOT the mainstream. Lube your weapon as required by the TM, wipe it down when finished, and lube again. It will be ready. If you do that, you won't even bother scraping carbon off the bolt tail, because it won't stick, and won't be there. It doesn't affect functioning anyway.

As little as some get shot, they need the lube as a rust preventative sitting cased in the closet for months at a time.

 

[Sky]

Tirod we are in total agreement. To me it is just some lubs work better and can run dryer than others. PTFE is some good stuff for friction points in the AR.

TRADOC; Ft. Monroe Va? Just wondered for I was flying out of Langley AFB but was stationed at Ft. Monroe. Robert B. Hixon 2 star was a bud of mine 1977.

 

[bushmaster1313]

Which lube should I use?
I have Ballistol and Rem Oil in the house

 

[Sky]

As per my earlier post several people I know use Breakfree CLP. Be sure it is CLP not Lp.... read the label and be sure it has PTFE. No it is not the only lube out there!!! It just works both as a lube and a rust preventive and is cheap at Walmart.

http://www.thegunzone.com/rust.html

Any of the lubes you have should work...ya just gotta use them. Ear wax might work if it was all you had but not recommended.

 

[TonyAngel]

I use Slip 2000 EWL. It doesn't run or bake off like some lubes I've used. It also makes clean up very easy. I only lube every 500 rounds or so and I've never found my rifle dry.

 

[FlyinBryan]

ive been using mobil1 synthetic for several years now.

ive seen mixed opinions on using automotive oil, but ive got 2 bushmasters with a combined 15k rounds and never a single stop of any kind.

i dont run mine dripping wet, but i dont let them run dry, ever. just a few drops on the bolt rails, lugs, cam pin, gas rings, light coat in the carrier.

 

[benEzra]

What weight buffer are you using? Standard carbine, H, H2, rifle, 9mm? Too heavy a buffer for your gas port size can cause insufficient BCG travel, AFAIK.

Agree on checking/replacing the spring.

Might not be a bad idea to ensure your magazines are upgraded to Magpul followers, since I assume you can't get P-mags in NJ?

FlyinBryan, I use Mobil 1 as well, though I run mine fairly wet. Very good results, fouling simply does not stick, and it doesn't dry up over time like a lot of gun-marketed lubricants do.

 

[FlyinBryan]

and it doesn't dry up over time like a lot of gun-marketed lubricants do.

ya, noticed that immediately too. open the rifle to clean up and its still there. after seeing its staying power i started using it in my carry pistol (1911 lightweight commander) because it would dry out so fast with conventional gun oil. stuff sticks almost like a light grease.

 

[TonyAngel]

What ever lube you use, I've found that synthetic is a good thing. Since I went to Slip, I lube far less frequently. I used to use Breakfree CLP. You can put that stuff on, put the rifle away, come back in a month and the rifle will be dry and you're like "where'd the lube go?" Haven't had that problem with Slip.

I am going to try the Mobil 1 though. I've heard a lot of people saying good things. I just really like the Slip and am going to use it until I run out. It is clear, doesn't smell like anything and works really well. From what I understand, the more you use it, the slicker the parts get. I've taken to cleaning my rifle with patches wetted with Slip. Everything wipes right off. After I clean it, I add a drop to each of the rings, cam pin, locking lugs and extractor. After I assemble the rifle, I put a drop or two in the channel in the charging handle and that's it. I just run a bore snake through the barrel and one. It takes about 20 minutes.

 

[doc2rn]

I would agree needs some CLP, we had alot of Army cast off A2s we used to run before being sent to Dermo. All of the ones that could pattern where wet! FWIW they keep sending the same barrels back to the manufacturer from Dermo and the bent ones get ground up.

 

[bushmaster1313]

The XM15 is oiled up and sounds great.
I guess this means more range time
Darn

 

[FlyinBryan]

bolt rails
cam pin
bolt lugs
bolt gas rings and bearing surface (just a light coat in the carrier, then a drop or two through the little holes @ the gas rings)

probably any lube mentioned in this thread will do fine (if used)

 

[MCMXI]

Have you had this problem from day one or did it show up after X amount of rounds? If it was from day one, I suggest you listen to benEzra re the buffer. If the problem started recently then check the spring as others have stated. The spring and buffer are very important but often overlooked.

 

[bushmaster1313]

How do I get to the spring and the buffer?
How do i get it closed up again?

 

[bushmaster1313]

I did not see this problem until I hit the bolt and bolt carrier with Gunscrubber.
Seems like I did not add back enough lube.

I will let the Forum know.

How do I get to the spring and the buffer?
How do i get it closed up again?

 

[Sky]

Go to youtube:

A picture is worth a thousand words!

Also if you are lubed up just go shoot it and if no problems then the buffer tube can be studied at a later date.

 

[TonyAngel]

Man, whenever you use a solvent that strips all of the lube off of the parts, you need to lube the heck out of it to get it to soak back into the finish and metal. Anything like straight mineral spirits or gun scrubber will strip everything!! You don't need to do that.

 

[briansmithwins]

This manual has all the details about how to strip and reassemble a AR15 rifle:

https://docs.google.com/fileview?id...I5OWQtZGVkYzdlMmQ3MjUx&hl=en&authkey=CLHOxfEG

BSW

 

[Uncle Mike]

It would not have occured to me that I should run my XM15 "wet".

Two things....
1) 'Everything' works better with lubrication
and
2) AR's are definitely included in 'everything'!

An AR HAS to run wet, don't be afraid, lube it...you wont cause a problem with too much lube, other than making a mess! lol

 

[C-grunt]

read up on Filthy 14

On 12-24-09 I contacted Pat Rogers to see what the current round count of the BCM 16" Mid-Length that he has been loaning out to students. Pat refers to this BCM Mid-Length as "Filthy 14" and provided me with the following information on this gun:

***************************************************************************************************************************************** "Filthy #14 is the most used, and has (as 12-24-09) 28905 rounds down range. The barrel is original. It has never had a brush put through it. -At 16,400 rounds bolt lug cracked. Replaced the bolt carrier group

-At approximately 26,000 rounds fired a 5 shot 50m group that went into 0.5". This might not be that tight at 100 meters.

-At 26,450 rds had 3 failures to extract. Replaced BCG and cleaned gun for the first time
We use only SLip2000 EWL for lube and Slip 2000 725 to clean.

**All of the rounds were fired during class (at the rate of approximately 1,250 rounds every 3 days)**

I do not recommend allowing the gun to go this long without PM (preventive maintenance). However, we wanted to see how far we could take this particular gun (#14) without being burdened by the myth of meticulous cleaning."

***************************************************************************************************************************************

Keep in mind the punishment that Pat Rogers' BCM mid-length has been put through. The gun is being shot approximately 8 hours a day in a tactical training class environment at the rate of approximately 1,250 rounds every 3 days. Very few people have the time, money, or effort to run a gun like that for 28,905 rounds. This upper has the standard barrel, not the new BFH (cold hammer forged) barrel.

article at http://www.03designgroup.com/reviews/bcm-complete-ar15-upper-and-lower-receivers

 

[Sky]

C-grunt Great post!!

I have a range that I go to that does the same thing only I am not sure about the round count. I do know he uses Breakfree clp in his guns and never cleans them either. That and some test results plus convenience got me started with the CLP but as others have indicated there are several good choices for lube on the market. Just gotta use them!

 

[bushmaster1313]

Having been appropriately admonished for making my XM15 go dry I assure the Forum I will not let this happen again.

Thanks to all!

 

[shtr45acp]

Call the folks at Bushmaster. I have dealt with them in the past and they will go out of their way to steer you in the right direction. Replacing the followers seems best to me for a start, but try some mil-spec alum 30 rounders.

 

[bushmaster1313]

Problem Resolved!

A few squirts of Rem-Oil on the rails, cam, rings, bolt, bolt carrier and the buffer and the problem is resolved!

Thank you to all.

 

[Sky]

Ta Da!!!