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Buffer and Spring Question #6168073 02/03/16 08:32 PM
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eneat1119 Offline OP
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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?

Re: Buffer and Spring Question [Re: eneat1119] #6168579 02/04/16 12:41 AM
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dredd Offline
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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.

Re: Buffer and Spring Question [Re: eneat1119] #6168596 02/04/16 12:52 AM
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Pitchfork Predator Offline
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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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hdfireman Offline
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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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The 6.8 is the #1 choice for hunting deer and hogs in an AR15
Re: Buffer and Spring Question [Re: hdfireman] #6169044 02/04/16 12:19 PM
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BassCat'99 Offline
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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.


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Re: Buffer and Spring Question [Re: eneat1119] #6169246 02/04/16 02:52 PM
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dredd Offline
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I had one cartridge stuck in my head.
Sorry.

Re: Buffer and Spring Question [Re: eneat1119] #6170515 02/05/16 03:11 PM
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eneat1119 Offline OP
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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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