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louieboots 07-01-2012 01:08 AM

BCM bolt carrier group
I bought a BCM bolt carrier group and it came with a small nut or something I'm not sure what it's for can anyone tell me? I'm new to the AR platform..

Quentin 07-01-2012 01:31 AM

O-ring? You don't need it, but save it just in case you do. :D

bradford027 07-01-2012 01:35 AM

Its an o-ring for under the extractor. Im running a 14.5" and mine works fine without it. I think it adds some uumph for extraction. I would run it without and see how it does, you can always add it later.

louieboots 07-01-2012 02:07 AM

Ok thank you guys!

JonM 07-01-2012 03:46 AM

if you can manage to get it in the bolt it REALLLLLLY chucks the empties FAR

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