No doubt. I'd give it a shot in my 300BLK and 9mm SBRs. The spring is currently about the loudest part to my ear.jcalvinmarks;n78645 said:I've wanted to try the JP Spring in my 300BLK SBR, but I can't bring myself to believe that there's really $130 worth of difference between a standard spring and buffer and the captured spring. But at $80, especially if the street price creeps closer to $50, that'll definitely be worth a shot.