Build a 300blk pistol build 300blk FA BCG or M16 BCG?

[Lawdog-1]

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?

[AndyLate]

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?

300 Blackout uses the 5.56 bolt/BCG, too easy.

Andy

[Lawdog-1]

Thanks