Are you thinking about build a new AR-15 pistol? Well you are going to need to keep that lower receiver pistol compliant with this pistol receiver extension kit. CMMG has created the perfect kit containing an AR-15 pistol receiver extension; ambidextrous sling end plate, carbine buffer and spring. This kit is designed to work correctly with both .300 AAC blackout and 5.56mm NATO AR pistol builds.
Features and Specifications:
Manufacturer Number: 55CA65A
Includes:
CMMG pistol receiver extension
Ambidextrous sling and endplate
Carbine buffer and Spring
Black
Fits:
.300 AAC Blackout or 5.56mm NATO pistol builds
Features and Specifications:
Manufacturer Number: 55CA65A
Includes:
CMMG pistol receiver extension
Ambidextrous sling and endplate
Carbine buffer and Spring
Black
Fits:
.300 AAC Blackout or 5.56mm NATO pistol builds
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How long is the arp 300 black out buffer spring?
What would you recommend would be the best buffer weight for a non suppressed 300 pistol?
Answer:
Hi Greg! Here is CMMG's answer to your question: "That would be a standard AR carbine buffer spring that's approx. 10.5" uncompressed. That buffer tube, spring and buffer are what we use for building our 300blk firearms which would be what I would recommend. One thing to note though, depending on the upper used, a lot of 300BLK will not cycle subsonic ammo if not suppressed. I know you didn't make mention of subsonic, but I like to just make sure people are aware of that in case they try running that ammo."