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#3292278 - 01/25/22 01:25 PM Have to use forward assist
Powerfisher Offline
Die Hard Member II

Registered: 03/19/10
Posts: 1855
Loc: Washington
Hey everyone. So I am having problems with my AR-10. It is a .308 and it is a DPMS LR 308 platform. It has a low profile non adjustable gas block. So, I have to use forward assist after every round or I get a light primer strike and it won't fire. When I chamber the first round by pulling the bolt back, it shoots fine but if the action is open after the last shot and I close the bolt by pushing the bolt release lever, it will not shoot unless I use forward assist. I have tried a stronger buffer spring but then it would be too stiff and it wouldn't grab a new round from the magazine. I cleaned my BCG thoroughly and have lube in all the right places. My next step is to replace the gas rings. Any other ideas?
_________________________
"Live to Shoot, Shoot to Live"
"Gun Control is being able to hit your target"


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#3292287 - 01/25/22 02:37 PM Re: Have to use forward assist [Re: Powerfisher]
SlickerThanSnot Offline
PM senior

Registered: 01/31/14
Posts: 5772
Loc: stuck in a fence
sounds like the brass is not sized enough. are these your hand loads or factory loads?
_________________________
skeptical is what i am when told there is a dead coyote in certain far off pictures.

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#3292291 - 01/25/22 03:05 PM Re: Have to use forward assist [Re: SlickerThanSnot]
Powerfisher Offline
Die Hard Member II

Registered: 03/19/10
Posts: 1855
Loc: Washington
I have used all factory ammo. Mostly military.
_________________________
"Live to Shoot, Shoot to Live"
"Gun Control is being able to hit your target"


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#3292293 - 01/25/22 03:49 PM Re: Have to use forward assist [Re: Powerfisher]
GC Offline
PM Junkie

Registered: 04/21/01
Posts: 16972
Loc: Missouri
Clean your chamber - thoroughly.
_________________________
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.

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#3292294 - 01/25/22 03:50 PM Re: Have to use forward assist [Re: Powerfisher]
Tonester Offline
Seasoned Member

Registered: 04/20/13
Posts: 442
Loc: SE Nebraska
Agree with GC. Start by using a chamber brush and clean thoroughly.

TC
_________________________
There is only one Lawgiver and Judge, the one who is able to save and destroy. But you--who are you to judge your neighbor?

James 4:12

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#3292295 - 01/25/22 03:51 PM Re: Have to use forward assist [Re: Powerfisher]
Tonester Offline
Seasoned Member

Registered: 04/20/13
Posts: 442
Loc: SE Nebraska
You could also test the military ammo with a case gauge (never hurts if you got one).

TC
_________________________
There is only one Lawgiver and Judge, the one who is able to save and destroy. But you--who are you to judge your neighbor?

James 4:12

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#3292296 - 01/25/22 03:55 PM Re: Have to use forward assist [Re: Powerfisher]
Bowhntr6pt Offline
Die Hard Member II

Registered: 04/09/13
Posts: 1050
Loc: Central Florida
Who made the barrel?

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#3292310 - 01/25/22 06:54 PM Re: Have to use forward assist [Re: Bowhntr6pt]
spotstalkshoot Offline
Die Hard Member III

Registered: 12/22/13
Posts: 2368
Loc: so.mn
Also make sure the gas tube and bcg are aligned properly and barrel nut gas tube are not touching. It would probably run without gas rings.


Edited by spotstalkshoot (01/25/22 06:55 PM)

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#3292313 - 01/25/22 07:01 PM Re: Have to use forward assist [Re: Powerfisher]
crapshoot Offline
Retired PM Staff

Registered: 03/22/02
Posts: 23109
Loc: Henderson,Nevada,USA
Might also check the barrel extension for burrs.
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I carry a gun because a cop is to heavy.

Average response time for a 911 call is 10 min.
Average response time for a .45acp is 900FPS.

Remember, if you're not pissing off a liberal......You are one!
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#3292316 - 01/25/22 07:37 PM Re: Have to use forward assist [Re: Powerfisher]
AdamT Offline
Die Hard Member III

Registered: 01/04/15
Posts: 2874
Loc: Southwest Virginia, USA
I would do a very thorough cleaning. If it only happened after firing a round, I would suggest checking your gas and recoil system as well. It should go into battery when using the bolt release. Clean it good, check the dimensions on the loaded ammo since it sounds like it may be mil surplus, also try a different magazine.
_________________________
Rich man rolls the dice, Poor man pays the price!

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#3292319 - 01/25/22 09:18 PM Re: Have to use forward assist [Re: Powerfisher]
Powerfisher Offline
Die Hard Member II

Registered: 03/19/10
Posts: 1855
Loc: Washington
Thank you all for your replies. I have cleaned it thoroughly but I did not use a chamber brush. I will invest in one asap. The barrel is stamped, DPMS 7.62X51 with a 1-10 twist. I have tried different magazines with no success. I will mic my ammo and make sure that it's within tolerance. My buffer weight is not adjustable and I was thinking that I may need a new one so that I can adjust the weight. Thanks again for the advise and I will report back with, hopefully, positive progress.
_________________________
"Live to Shoot, Shoot to Live"
"Gun Control is being able to hit your target"


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#3292349 - 01/26/22 12:45 AM Re: Have to use forward assist [Re: Powerfisher]
SubpaR Offline
Seasoned Member

Registered: 09/27/15
Posts: 435
Loc: Hays, KS
Was it bought new or used. If bought new, it probabaly wouldn't hurt to manually cycle the BCG a few hundred times to speed up the break in period. Just adding some spitballs...

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#3292379 - 01/26/22 09:56 AM Re: Have to use forward assist [Re: SubpaR]
Powerfisher Offline
Die Hard Member II

Registered: 03/19/10
Posts: 1855
Loc: Washington
It was used but with a very low round count.
_________________________
"Live to Shoot, Shoot to Live"
"Gun Control is being able to hit your target"


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#3292403 - 01/26/22 01:19 PM Re: Have to use forward assist [Re: Powerfisher]
Coyote-conquest Offline
Seasoned Member

Registered: 02/01/18
Posts: 226
Loc: Kentucky, US
It may just need broke in really well. I had a 223 AR that took quite a few rounds to break in before it would seat a round every time. That and clean it really good.

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#3292431 - 01/26/22 05:32 PM Re: Have to use forward assist [Re: Powerfisher]
Plant.One Offline
Die Hard Member with a vengeance

Registered: 02/12/15
Posts: 4866
Loc: Oakland County, MI
have you tried more than one magazine?

you could easily be dragging on the feed lips or something similar. DPMS LR series rifles are known to be especially fond of magpul LR/SR series 308 mags. and we all know how fussy some metal mags can be. one wrong feed lip angle, or a little burr... and you got trouble.




as others have mentioned i would suggest hand cycling it to break it in after giving it a really thorough cleaning of the bcg, barrel, chamber, and barrel extension.

start by delubing the [beeep] out of it. take the BCG out and spray it with brake clean or gun scrubber. same goes for the upper itself. if you have an ultrasonic cleaner, disassemble the bcg and drop it in there first for 8-10 mins. then brake clean & scrub to get all the carbon out. when you reassemble you want that thing DRY DRY DRY. like painfully dry. you should cringe putting any rifle back together this dry type of dry.


then hand cycle it without any ammo several hundred times. pull the bolt and let it fly. wash, rinse, repeat. this dry lapping process will allow mating surfaces to smooth out on each other and run any burrs off that might be holding things up.

HTH and keep us in the loop on how things work out!
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All reloading info shared is based on my experiences in my guns. Follow safe reloading practice and work up loads from published minimum data.
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