American Defense Manufacturing M-Lok Rail Upper Receiver .300 Blackout 10.5in ADM Nitrite BCG Black. 5 Inch Barrel M-Lok Rail Upper Reciever lives up to its name. American Defense Manufacturing crafted this .300 AAC Blackout Rifle Upper Receiver with a brushed stainless steel finish and a M-LOK rail so that you can equip all of your favorite accessories. This American Defense Manufacturing 300 Out 10.5 Inch Barrel M-Lok Rail Upper Receiver also features a Nitrite Bolt Carrier Group (BCG) and a Raptor Charging Handle. Upgrade your firearm with this American Defense Manufacturing 300 Out 10.5 Inch Barrel M-LOK Rail Upper Receiver to get a dependable firearm for your range training and shooting needs. Specifications for American Defense Manufacturing 300 Out 10.5 Inch Barrel M-Lok Rail Upper Reciever: Manufacturer: American Defense Manufacturing Caliber: .300 AAC Blackout Barrel Length: 10.5 in Muzzle Device: Surefire Warcomp Finish: Matte Color: Black Gun Rail: M-LOK Additional Features: ADM Nitrite BCG Included Accessories: Battle Comp Muzzle Device Magazine Included: No Features of American Defense Manufacturing 300 Out 10.5 Inch Barrel M-Lok Rail Upper Reciever: M-LOK Rail Package Contents: American Defense Manufacturing 300 Out 10.5 Inch Barrel M-Lok Rail Upper Reciever American Defense Manufacturing UICCUBOBLK10M2MLOK: .300 Blackout 10.5 Inch Barrel M-Lok Rail Upper Reciever Contains ADM Nitrite BCG Black