Aim7 Nielsen Booster Assembly Stainless Steel Black with Piston

Note: INCLUDE PISTON Aim7 Nielsen Booster Assembly 1/2 x 28 TPI (CZ, 1911, FNH, S&W 9MM,22LR) 1/2 x 36 TPI (9MM) 5/8 x 24 TPI (.30 CAL) 9/16 X 24 TPI (.40 CAL) .578 X 28 (.45ACP) M13.5 X 1LH (GLOCK, STYER, SIG, HK, B&T 9MM) Features Replaces your Direct Thread Adapter 17-4 Stainless Steel Matte Black Finish 1-3/8”-24 Mount Thread Pitch