American Defense Manufacturing 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever Black 12.5 in. 56 12.5 Inch Barrel M-Lok Rail Upper Reciever: Manufacturer: American Defense Manufacturing Caliber: 5.56x45mm NATO Barrel Length: 12.5 in Muzzle Device: Surefire Warcomp Finish: Matte Color: Black Gun Rail: M-LOK Gun Model: AR-15 Magazine Included: No Features of American Defense Manufacturing 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever: M-LOK Rail Package Contents: American Defense Manufacturing 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever What firearm models does the manufacturer say American Defense Manufacturing 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever is compatible with? The manufacturer suggests that American Defense Manufacturing 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever is compatible with AR-15American Defense Manufacturing UICCUBLK12M2MLOK: 5.56 12.5 Inch Barrel M-Lok Rail Upper Reciever Black 12.5 in