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Posted: 4/14/2017 5:01:32 PM EST
[Last Edit: 4/14/2017 5:03:35 PM EST by stascom]
AR15 carbine extension with Palmetto 308 buffer (DPMS?) and DPMS spring is a go? I have a spring I've purchased a long time ago that I thought was a DPMS 308 carbine spring. But it collapses fully and still prevents the carrier from clearing the bolt catch; it's too long. It's shorter than my rifle-length AR15 springs. Must be the AR-10 carbine spring, right?
Link Posted: 4/14/2017 5:21:48 PM EST
Originally Posted By stascom:
AR15 carbine extension with Palmetto 308 buffer (DPMS?) and DPMS spring is a go? I have a spring I've purchased a long time ago that I thought was a DPMS 308 carbine spring. But it collapses fully and still prevents the carrier from clearing the bolt catch; it's too long. It's shorter than my rifle-length AR15 springs. Must be the AR-10 carbine spring, right?
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The reason you cannot pull back BCG far enough to clear bolt catch is that your buffer tube is 3/4" too short. PSA 308 buffer is actually AR15 buffer not sure the weight. For 308 you need to use PSA or Armalite or A5 buffer tube, which is 3/4" longer than standard AR15 tube. As for the spring, DPMS 308 carbine spring has 29 coils and ~11.5" long.
Link Posted: 4/17/2017 1:53:14 AM EST
I have a complete CMMG 308 lower. It has the same buffer tube (AR15 carbine), same buffer (308, short) but a different spring from anything I have laying around. It works perfectly with 2 assembled 308 uppers. I'll need to count the number of coils on it.
Link Posted: 4/18/2017 5:38:56 AM EST
CMMG spring is 26 coils and 10.75" long...
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