A3 Industries HK MP5-22LR Rear Stock Adapter Picatinny 1913 Mount

A3 Industries HK MP5-22LR Rear Stock Adapter Picatinny 1913 Mount. Completely unique in design this adapter provides improved stability by covering more surface area of the receiver. The A3 Industries adapter allows the use of A3 Industries's complete line of modular stocks and braces and can also be configured with a Picatinny rail. The Picatinny rail will allow you to adapt any side folding stock (or arm brace) designed for use with Picatinny style mounts. The bolt pattern and locating lug on