AR-15 SBR requirements ?

[ShaunyP26]

Poobags...you're right. Forgot about the Executive order nonsense...



From what I understand, a 556 SBR is more wasteful than a 300 SBR in terms of velocity loss, flash, and reliability. In theory, a 9" SBR and a 16" rifle in 300blk, shouldn't show any serious difference in ballistics?

Whoops. Sorry I missed this one before my first reply.