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Buffer and Spring Question
#6168073
02/03/16 08:32 PM
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Joined: Feb 2012
Posts: 1,755
eneat1119
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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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Re: Buffer and Spring Question
[Re: eneat1119]
#6168579
02/04/16 12:41 AM
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Joined: Apr 2010
Posts: 1,231
dredd
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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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Re: Buffer and Spring Question
[Re: eneat1119]
#6168596
02/04/16 12:52 AM
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Joined: Jan 2013
Posts: 19,652
Pitchfork Predator
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Pretty sure you need a buffer and spring for an AR-10, not AR-15.
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Re: Buffer and Spring Question
[Re: eneat1119]
#6168601
02/04/16 12:55 AM
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Joined: Nov 2009
Posts: 915
hdfireman
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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.
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Re: Buffer and Spring Question
[Re: hdfireman]
#6169044
02/04/16 12:19 PM
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Joined: Feb 2013
Posts: 1,389
BassCat'99
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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.
22 Creedmoor
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Re: Buffer and Spring Question
[Re: eneat1119]
#6169246
02/04/16 02:52 PM
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Joined: Apr 2010
Posts: 1,231
dredd
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I had one cartridge stuck in my head. Sorry.
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Re: Buffer and Spring Question
[Re: eneat1119]
#6170515
02/05/16 03:11 PM
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Joined: Feb 2012
Posts: 1,755
eneat1119
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Thank you gentlemen. I went ahead and ordered a JP Silent Captured Spring. Thought why not? Anyone have any experience with these?
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