308 buffer tube question

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[ARCHIVED THREAD] - 308 buffer tube question

Posted: 5/17/2017 10:09:20 AM EDT

Am I right that I can use an AR15 carbine buffer tube with the short 308 buffer and 308 buffer spring in my DPMS profile 308 ? I am using a carbine stock not an A2. Will this work? What is the difference in 308 buffer tube and AR15 buffer tube? This is a PSA lower receiver (. Gen2 ) and Aero Precision upper receiver

Posted: 5/17/2017 11:23:30 AM EDT

[#1]

With an AR15 carbine tube, you have to use the short 308 buffer.

You can also use an AR10 or VLTOR A5 tube and stick to regular AR15 carbine buffers.

As far as springs, I'll let someone else comment.

Posted: 5/17/2017 4:38:04 PM EDT

[#2]

You can use a standard, carbine AR15 buffer tube. You will need the short .308 buffer and a .308 carbine spring.

The Armalite .308 carbine buffer tube is 3/4" longer which allows the use of an AR15 buffer and Armalite rifle length .308 spring.

The advantage of the longer, AR15 buffer is it has more weights. If all of these weights are tungsten (H3) it will be heavier than a small .308 buffer with tungsten weights. The heavier buffer will aid in reliability and recoil management.

Either system should work for you.

Posted: 5/17/2017 11:34:39 PM EDT

[#3]

Will an AR-15 (CAR) stock fit an AR-10?

Yes (with caveats). You will need to use either the carbine AR-15 carbine lower receiver extension (buffer tube) with an AR-10 spring and a shorter AR-10 buffer (to allow for the longer AR-10 bolt carrier group) or an AR-15 stock and the AR-10 buffer tube (but it will not collapse all the way). The A2 stocks are the same. The AR-10 rifle buffer is a little shorter in the AR-10 rifle.

From Armalite Website

Posted: 5/19/2017 10:28:23 AM EDT

[#4]

Armalite is a bad example as their buffers are longer.

Quote History

Quoted:

Will an AR-15 (CAR) stock fit an AR-10?

Yes (with caveats). You will need to use either the carbine AR-15 carbine lower receiver extension (buffer tube) with an AR-10 spring and a shorter AR-10 buffer (to allow for the longer AR-10 bolt carrier group) or an AR-15 stock and the AR-10 buffer tube (but it will not collapse all the way). The A2 stocks are the same. The AR-10 rifle buffer is a little shorter in the AR-10 rifle.

From Armalite Website

View Quote

Posted: 5/19/2017 3:32:09 PM EDT

[#5]

Thanks everyone, I think I've got things coming together right. 1st 308 build and want to do it right the first time. World of knowledge here amongst deplorables.

Posted: 5/19/2017 4:40:12 PM EDT

[#6]

Quote History

Quoted:

You can also use an AR10 or VLTOR A5 tube and stick to regular AR15 carbine buffers.

As far as springs, I'll let someone else comment.

View Quote

that is what i use and seems to work great. i bought a 6.5 oz carbine length buffer from slash and use the 308 spring that comes with it but its basically the same length as a rifle spring, just a higher rate i guess.

i wasnt very fond of the shorty 308 buffer in the carbine tube. just too much recoil in the 308 and the bushy barrel i have might have the gas port just a tad too large.

if you like rifle length stocks you can run those with a rifle length tube, spring and buffer from a 556 without issue. it had just enough rearward travel to lock the bolt back.

Posted: 5/20/2017 6:01:05 PM EDT

[#7]

Really, The H3 buffer on the right is from an Armalite AR10 with sliding stock and on the left is a standard H buffer from an AR15.

Quote History

Quoted:
Armalite is a bad example as their buffers are longer.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:
Armalite is a bad example as their buffers are longer.

Quoted:

Will an AR-15 (CAR) stock fit an AR-10?

Yes (with caveats). You will need to use either the carbine AR-15 carbine lower receiver extension (buffer tube) with an AR-10 spring and a shorter AR-10 buffer (to allow for the longer AR-10 bolt carrier group) or an AR-15 stock and the AR-10 buffer tube (but it will not collapse all the way). The A2 stocks are the same. The AR-10 rifle buffer is a little shorter in the AR-10 rifle.

From Armalite Website

Posted: 5/20/2017 8:48:16 PM EDT

[#8]

Quote History

Quoted:
Really, The H3 buffer on the right is from an Armalite AR10 with sliding stock and on the left is a standard H buffer from an AR15.

http://i.imgur.com/kvuaoFK.jpg http://i.imgur.com/V4WvIoi.jpg

View Quote

I think he meant compared to other 308 buffers, they are longer. Longer being normal length 556 buffer. DPMS and Slash's 308 buffers are too short for the a5 tube and the bolt carrier will hit the receiver.

As far as spring when using the vltor a5 tube and standard buffer(I use an h3 in my lr308) use an Armalite 308 rifle spring.(part #- armea1095)

Posted: 5/20/2017 9:41:23 PM EDT

[#9]

dump a mag you might need a stronger spring and heavier buffer.

I had to go with a jp +10 and kak 5.5 carbine and went adjustable gas. the bcg could come back to fast and hit the lower receiver

Posted: 5/21/2017 3:31:29 PM EDT

[#10]

Quote History

Quoted:
You can use a standard, carbine AR15 buffer tube. You will need the short .308 buffer and a .308 carbine spring.

The Armalite .308 carbine buffer tube is 3/4" longer which allows the use of an AR15 buffer and Armalite rifle length .308 spring.

The advantage of the longer, AR15 buffer is it has more weights. If all of these weights are tungsten (H3) it will be heavier than a small .308 buffer with tungsten weights. The heavier buffer will aid in reliability and recoil management.

Either system should work for you.

View Quote

I run the Armalite carbine set up on my DPMS and it has never had an issue.

[ARCHIVED THREAD] - 308 buffer tube question

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