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Max Online: 16728 @ 03/25/12 08:51 AM
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#6168073 - 02/03/16 02:32 PM Buffer and Spring Question
eneat1119 Offline
Pro Tracker

Registered: 02/22/12
Posts: 1151
Loc: MIDLAND
Just bought a new CMMG CBR in 308.

Took off the ACS-L and accompanying buffer tube. Replaced with a UTG A2 buffer tube for Ar15 and Magpul MOE Fixed Stock.

Currently I'm using the buffer that came with the 308/ACS-L and using the spring that came with the UTG A2 Ar15 stock buffer tube.

Is this going to work or do I need to replace either the buffer or the spring or both?
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#6168579 - 02/03/16 06:41 PM Re: Buffer and Spring Question [Re: eneat1119]
dredd Offline
Tracker

Registered: 04/26/10
Posts: 899
Loc: Dallas / Fort Worth Area
Measure the depth of the two "tubes".

If they are the same, no changes required.

If the new one is deeper, you can simply add a spacer.

If the new one is shallower, you'll most likely need a different buffer & spring.

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#6168596 - 02/03/16 06:52 PM Re: Buffer and Spring Question [Re: eneat1119]
Pitchfork Predator Offline
THF Celebrity

Registered: 01/25/13
Posts: 11369
Loc: Murphy, TX Dickens county
Pretty sure you need a buffer and spring for an AR-10, not AR-15.
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Marc C. Helfrich
Retirement Planner

www.insured-wealth.com
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#6168601 - 02/03/16 06:55 PM Re: Buffer and Spring Question [Re: eneat1119]
hdfireman Offline
Tracker

Registered: 11/29/09
Posts: 719
Loc: Flower Mound
If I read this correctly you have a carbine buffer in a rifle buffer tube with an AR-15 buffer spring. No good.

The AR-15 Spring is to light for the AR-10 which could cause harsher recoil and cycling issues. The buffer is to short for the rifle buffer tube. They have the little bumpers on them because they can/will bottom out in the tube which keeps them from traveling to far. With a shorter buffer and lighter spring the carrier could over travel.

Replace with a .308 rifle buffer and .308 buffer spring.
_________________________

eric@blackstonearms.com
214-945-5520
The 6.8 is the #1 choice for hunting deer and hogs in an AR15

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#6169044 - 02/04/16 06:19 AM Re: Buffer and Spring Question [Re: hdfireman]
BassCat'99 Online   happy
Tracker

Registered: 02/15/13
Posts: 953
Loc: Stratford Texas
Originally Posted By: hdfireman
If I read this correctly you have a carbine buffer in a rifle buffer tube with an AR-15 buffer spring. No good.

The AR-15 Spring is to light for the AR-10 which could cause harsher recoil and cycling issues. The buffer is to short for the rifle buffer tube. They have the little bumpers on them because they can/will bottom out in the tube which keeps them from traveling to far. With a shorter buffer and lighter spring the carrier could over travel.

Replace with a .308 rifle buffer and .308 buffer spring.
This be true, if ar15 spring/tube/buffer used it will not cycle right, will have chambering problems.
_________________________
TS

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#6169246 - 02/04/16 08:52 AM Re: Buffer and Spring Question [Re: eneat1119]
dredd Offline
Tracker

Registered: 04/26/10
Posts: 899
Loc: Dallas / Fort Worth Area
I had one cartridge stuck in my head.
Sorry.

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#6170515 - 02/05/16 09:11 AM Re: Buffer and Spring Question [Re: eneat1119]
eneat1119 Offline
Pro Tracker

Registered: 02/22/12
Posts: 1151
Loc: MIDLAND
Thank you gentlemen. wink

I went ahead and ordered a JP Silent Captured Spring. Thought why not? Anyone have any experience with these?
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