CMMG's customer service and product lineup are second to none. All of their rifles and firearms parts are made in the United States from the best materials available. The Mk4LE is their basic rifle, featuring a nitrided 16.1″ 4140 CrMo steel barrel in an M4 profile. The barrel has 1/2-28 threads and a 1 in 16" twist and comes with an A2 compensator. The stock is telescopic with six positions of adjustment for a precise fit on any shooter's shoulder. The receiver is made up of a forged 7075-T6 AL M4-type upper with an AR15-type lower. The standard configuration includes a “F” marked front sight base and a Magpul MBUS rear sight. M4 type 2-piece hand guards. A2 pistol grip. Single stage mil-spec trigger. 30-round .22 LR magazine.