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Old 02-17-2012, 02:50 PM   #11
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Originally Posted by mjkeat View Post
The threads and diameter of the portion that is threaded is the same. Before the release of VLTORs A5 guys used their .308 receiver extension on AR15s to get an A2 like buffer system with the ability to still have a collapsible stock.
Good info. I STILL don't recommend DPMS collapsable stocks, for the reasons I have stated in past threads. Ok, I know I keep kicking a dead horse.
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Old 02-17-2012, 03:04 PM   #12
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Originally Posted by mjkeat View Post
The threads and diameter of the portion that is threaded is the same. Before the release of VLTORs A5 guys used their .308 receiver extension on AR15s to get an A2 like buffer system with the ability to still have a collapsible stock.
Thanks, MJ, good info as fsted2a said. Way back in the 1950s you'd think ArmaLite would have used the same receiver extension threads for the AR-10 and AR-15 (no reason not to since the AR-10 was first and the same tube could be used in the scaled down AR-15). And why not carry forward to the new ArmaLite company AR-10B, DPMS, BM and RRA but you never know until someone tries it.
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Old 02-17-2012, 03:06 PM   #13
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Good info. I STILL don't recommend DPMS collapsable stocks, for the reasons I have stated in past threads. Ok, I know I keep kicking a dead horse.
Fsted2a, no argument here!
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Old 08-04-2012, 12:03 PM   #14
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Just to clear up (or add to) the confusion. There are three variations of collapsible buffer tubes used on the more popular 308 AR's. The main difference being the depth of the hole drilled inside the tube. I don't have the exact specs off the top of my head so bear with me.

DPMS LR308 (and probably others) uses a tube with a 7" deep hole. They require a shorter buffer than the Armalite or RRA models. This tube is also the one used on standard AR15's.

Armalite AR10 uses a tube with a 7 3/4" deep hole. They use a buffer that is roughly the same length as the standard AR15 buffer but the 308 buffer is heavier - approximately the same weight as the H3 buffer.

RRA (and probably the discontinued Bushmaster) use a tube that is drilled (I believe) a little over 8" deep. I belive they also use a standard length carbine buffer but I'm not sure of the weight.

Hope that helps.

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