Features an innovative reverse venting triple baffle design for the highest recoil reduction in its class. Closed bottom construction combined with upward biased venting effectively eliminates both muzzle rise and dust signature. Precision machined from heat treated stainless steel for superior durability, the M4-72 can withstand the extreme heat of combat conditions without being subject to rapid erosion. Available with an advanced IonbondA(R) high temperature CrCN coating (matte black). Designed to fit AK-47 style rifles (7.62x39mm) with 14x1mm LH threads. Comes with two heavy duty proprietary crush springs (2 installations) offering the required pre-load for a rock solid fit a Mfg: Precision Armament SPECS: HTSR 416 stainless steel bar stock, matte black or in-the-white stainless steel finish. 14x1mm LH threads. 2.25" (5.2cm) OAL. 0.875" (2.2cm) dia. 2.6 oz (73.7g) wt. Designed to fit AK style rifles chambered in 7.62x39mm.