Samson Manufacturing Corp. Enhancer, Black 04-06031-01 Designed to fit 1/2x28 threaded barrels" the Samson Pocket Comp for the M&P 9 Shield and M&P 9 Shield M2.0 installs in minutes without the need for gunsmithing. The Samson design uses a threaded interface which protects the barrel threads unlike conventional compensators. The Pocket Comp efficiently reduces felt recoil and muzzle rise" allowing faster recovery between shots with iron-sight or red-dot equipped pistols. It functions with the factory recoil spring using a wide range of bullet weights and velocities.