Serious AR-10 Stovepipe issues.

N

NIevo

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Minuteman
Feb 3, 2011
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Idaho
#1
Just finished my AR-10 build and am having serious stovepipe issues. Will not fire more then one round without a stovepipe. The empty round will be stuck half in and half out of the ejection port and the loaded round will be half in the chamber. It is bad enough that the loaded round will actually be bent in half as it is stuck between the empty and the chamber. If I just load a single round and fire then it ends up just sitting loose on the mag and not ejecting with the bolt held open. Any suggestions on what could be causing it?

BHW 24" Bull Barrel in .260 Remington
Black Rain Ordinance upper and lower
Magpul PRS stock with standard AR-10 buffer and spring
AIM Nickel Boron .308 BCG
 
#3
I would also trouble shoot by taking these steps..

Drop test: Insert a round in your chamber by hand then point your muzzle up to see if the round falls out, if it does NOT fall out you my have a overly tight chamber.

Check your Gas: make sure your gas block is properly aligned, and if it's adjustable make sure it's open.

But more then likely it sounds like you have a extractor issue.
 
Last edited:
#4
BC83 said:
I would also trouble shoot by taking these steps..

Drop test: Insert a round in your chamber by hand then point your muzzle up to see if the round falls out, if it does NOT fall out you my have a overly tight chamber.

Check your Gas: make sure your gas block is properly aligned, and if it's adjustable make sure it's open.

But more then likely it sounds like you have a extractor issue.
Click to expand...


Round goes in and out of chamber easily.

Barrel had a indent for the block screw, not sure how I could align differently? It isn't adjustable though.

I will give JP a call tomorrow and talk about possible extractor problems.
 
#7
Since you are getting extraction and bolt hold open with one round, that makes me lean towards the ejector, then the extractor.

If it's the ejector, it could have a burr or debris in the channel, or a weak AR15 ejector spring.

If it's the extractor, it might need tuning on the lip, or an increased power extractor spring. If the extractor is slipping off the rim too quickly, it can cause the malf's you are having.

What load are you shooting, and what is your gas port diameter? If the load is gassing the gun too hard, excessive carrier velocity can cause extractor slip and these types of malfs.

JP is of the opinion that .260 Rem gassers are a reloader's system, and that is my experience as well. I never once considered that I would shoot factory ammo through any of my .260 Rem. AR10's.
 
#8
I have a Black Rain 308 that exhibited the same problems. Black Rain sent me a new extractor and ejector didn't fix it. I sent them the gun back and they replaced the bolt didn't fix it. I went them the gun again and they put the BCG on a lathe and saw that it had a bulge. They replaced it with a JP LMOS CBCG to my surprise no problems since.
 
#10
I had the same issue on my maten when I put a JP Enhanced bolt on it. But buddy put the extractor and spring from his REPR in my bolt and shot it with zero malfunctions...
 
#12
LRRPF52 said:
Since you are getting extraction and bolt hold open with one round, that makes me lean towards the ejector, then the extractor.

If it's the ejector, it could have a burr or debris in the channel, or a weak AR15 ejector spring.

If it's the extractor, it might need tuning on the lip, or an increased power extractor spring. If the extractor is slipping off the rim too quickly, it can cause the malf's you are having.

What load are you shooting, and what is your gas port diameter? If the load is gassing the gun too hard, excessive carrier velocity can cause extractor slip and these types of malfs.

JP is of the opinion that .260 Rem gassers are a reloader's system, and that is my experience as well. I never once considered that I would shoot factory ammo through any of my .260 Rem. AR10's.
Click to expand...

I'm getting bolt hold open with one round but not complete extraction, the empty case is still sitting loose on the mag.

I've shot both factory Federal Fusion loads and custom Southwest Ammunition 139gr Lapua's.

Not sure of gas port size, just a normal bull barrel block and rifle length tube.
 
#18
NIevo said:
Just talked to BHW and they said their port sizes are .100", does that seem a little big to you guys?
Click to expand...

Yes it does, way too big. I'm thinking in the .078 to .086 region, depending on barrel length. You need to put an adjustable block on there and tame that puppy down.

Your port is probably going to erode faster either way. Either that or add mass and recoil spring strength. Call up JP and see if there is a spring weight on the Silent Captured Spring that will fight your carrier enough with that port size.

The only reason I can see someone drilling a port that large on a RLGS 24" .260 Rem is with the intent to choke it with an adj block. Port pressure on a .260 Remington is way higher than most other AR gas systems, since we're dealing with slow burning powders, and long bearing surface bullets with substantial weight to them.

Bartlein popped in here recently and said that a .086" port is ideal for a 6.5 Creedmoor, which has basically the same pressure curve as a .260 Remington.
 
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