The Boonie Packer Better-Mag S&W .22 Rimfire Magazine Adaptor allows AR15 .22 conversion shooters to use S&W M&P 15-22 magazines, with their ultra reliable last round hold open activation and easy to load thumb assist.
This is by far and away the most reliable Bolt Hold Open device available today for AR15 .22 conversions such as CMMG.
Compatible with most AR15 .22 conversion uppers, the adaptor is easily fitted without tools, simply insert into the magazine well and it locks in place with a spring loaded plunger.
CNC machined from 6061 aluminium alloy with case hardened 1018 steel components the adaptor is built to meet the same milspec requirements of the receiver it will be sitting in.
Will not work with Chiappa, DPMS, Kriss and Tactical Solutions lowers.