The 20/22 Stabilizer Kit with Arm Brace is the first truly affordable stabilizer brace kit available on the market available for the SW Shield.Features* Ready for use out of the box* Simple installation (see video)* Uses the Guns built in sights, no need to calibrate sights* Compatible with compensators* Compatible with Red Dot optics* No pistol disassembly or permanent modifications required* Ergonomic no modifications required MCH Charging Handle (or charging can be done using a red dot optic)* Lightweight and compact* Made from glass reinforced polymer* Modular with optional picatinny rail adapters* Increases accuracy* Fully functional with folded armbrace* Compatible with the G7 proprietary holsterCompatible with M&P Mod 1 Full Size or Compact 9mm/40, with a rail, no safety (not compatible with C "Sub Compact" versions).***Your gun must have an extended beaver tail with no safety. If the M&P gun does not have an extended beaver tail then it will not fit.