THE ULTIMATE GUIDE TO 300 BLACKOUT BULK AMMO

Quoted: I don't know my rounds counts, but I have two .three hundred Blk SBRs both equally of them have well in excess of that, most that has a Suppressor And that i haven't experienced any challenges yet.Nope.  You're burning much more powder than .22 LR, plus your ear is right next to the ejection port, along with the buffer and spring bouncing