Dumb question, I am building a 300Blk pistol / SBR upper. Would I need a 5.56mm or 300 Blk Bolt to pair w/ 5.56mm FA carrier?
Dumb question, I am building a 300Blk pistol / SBR upper. Would I need a 5.56mm or 300 Blk Bolt to pair w/ 5.56mm FA carrier?
Thanks
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