The Mk4 S is the perfect rifle for the tree stand or target range. The Mk4 S utilizes an 18″ 416 stainless steel medium taper barrel chambered in 5.56x45mm NATO and CMMG’s RKM14 KeyMod handguard. The KeyMod handguard is ready to accept any number of the sling mounts, bi-pods, and other KeyMod compatible accessories making the ultimate in versatility and modularity. The barrel features an A2 compensator, 1/2-28 threads, and a 1 in 7" twist. The M4 buttstock has 6-positions of adjustment and a mil-spec receiver extension. The receiver is made up of a forged 7075-T6 AL M4-type upper with an AR15-type lower. A full-length Picatinny top-rail provides ample space for scopes, sights, or lasers. A2 pistol grip. Single stage mil-spec trigger. 30-round magazine.