Stern Defense Conversion Block - M&P And P320/P250 9mm And .40 S&W Magazines Bolt Carrier Groups 250 takedown pin holes

250 takedown pin holes

you press the button on the forward assist assembly

5" Outside diameter

300 Blackout

Stern Defense Conversion Block - M&P And P320/P250 9mm And .40 S&W Magazines Bolt Carrier Groups 250 takedown pin holesThe Stern Defense Magazine Conversion Block allows you to use 9mm or . 40 S&W P320 P250 and M&P magazines in your favorite standard AR 15 lower receiver. This magazine adapter installs in seconds and features last round bolt hold open functionality a welcome improvement when compared to other PCC builds. The Stern Defense MAG ADMP9&40 adapter is constructed from 6061 T6 aluminum with a 4140 steel NiB coated feed ramp and are designed to be used with a