Mitchell Defense DOC 16in 5.56 NATO Upper Receiver Cold Hammer Forged Chrome-Lined Barrel Black Finish M-LOK Free-Float Handguard. 56 NATO Upper Receiver provides superior heat control and reduced system weight through its barrel construction. The billet 7075-T6 receiver uses a thermal-fit barrel seat to enhance rigidity and promote consistent barrel harmonics. The ArmorLube Carbon Cutter BCG with Carpenter 158 HP/MPI bolt ensures dependable cycling with excellent carbon resistance. The M-LOK free-float handguard supports flexible accessory placement. The E-Series Cerakote finish ensures corrosion and abrasion resistance. This upper is ideal for shooters who need a lightweight accurate and durable 16in configuration. Specifications for Mitchell Defense The DOC AR-15 5.56mm NATO 16in Upper Receiver: Manufacturer: Mitchell Defense Caliber: 5.56x45mm NATO Overall Length: 25 in Barrel Length: 16 in Barrel Profile: Standard Gas System Length: Mid Length Barrel Twist Rate: 1-7 Threads per Inch: Non Threaded Muzzle Device: A2 Flash Hider Finish: Nitride Gun Model: AR-15 Fabric/Material: 4150 CrMoV Gun Make: AR Platform Bolt Carrier Group Included: MIL-SPEC Charging Handle Included: MIL-SPEC Features of Mitchell Defense The DOC AR-15 5.56mm NATO 16in Upper Receiver Thermal-fit billet 7075-T6 upper minimizes barrel movement under heat Carbon Cutter ArmorLube BCG with C158 HP/MPI bolt ensures reliable smooth cycling Free-float M-LOK handguard offers stable and ergonomic accessory mounting E-Series Cerakote improves wear and corrosion resistance Ideal for shooters wanting lightweight precision in a 16" configuration Package Contents: Mitchell Defense The DOC AR-15 5.56mm NATO 16in Upper Receiver What firearm models does the manufacturer say Mitchell Defense The DOC AR-15 5.56mm NATO 16in Upper Receiver is compatible with? The manufacturer suggests that Mitchell Defense The DOC AR-15 5.56mm NATO 16in Upper Receiver is compatible with AR-15Mitchell Defense 462111: DOC 16in 5.56 NATO Upper Receiver Cold Hammer Forged Chrome-Lined Barrel Black Finish M-LOK Free-Float Handguard