5.7X28MM SEMI AUTO 20 ROUNDS 8 BARRELDiamondback Tactical Pistol DBX57CF features a semi-auto action with a locked breech, dual gas piston operating system. Featuring a dark grey aluminum frame and handguard, the handguard is M-LOK compatible; DBX muzzle device with a thread pattern of 1/2×28 RH; standard AR15 Mil-Spec trigger and includes a 20rd magazine that is FN Five-SeveN compatible.