The Mk4 PDW is CMMG’s smallest, most compact upper equipped with the RKM7 KeyMod free floating hand guard, a nitrided 4140 CrMo steel barrel, and CMMG’s lifetime quality guarantee. Features: - RKM7 KeyMod free floating hand guard - 4140 CrMo steel barrel - Small and light Weight Specifications: - Caliber: 9x19 NATO - Barrel: 8.5" Barrel, Nitrided 4140 Chrome-Moly Steel, 1:10" Twist, 1/2"-36 Threaded - Hand Guard: RKM7 KeyMod Handguard - Sights/Gas Block: NA - Bolt Group: Mk9 Bolt Group
