DEMO American Defense Manufacturing 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever Black 10.5 in UICCUBLK10M2MLOK. 56 10.5 Inch Barrel M-Lok Rail Upper Reciever: Manufacturer: American Defense Manufacturing Caliber: 5.56x45mm NATO Barrel Length: 10.5 in Finish: Anodized Color: Black Gun Model: AR-15 Gun Rail: M-LOK Magazine Included: No Features of American Defense Manufacturing 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever: M-LOK Rail Package Contents: American Defense Manufacturing 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever What firearm models does the manufacturer say American Defense Manufacturing 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever is compatible with? The manufacturer says that American Defense Manufacturing 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever is compatible with AR-15American Defense Manufacturing UICCUBLK10M2MLOK: 5.56 10.5 Inch Barrel M-Lok Rail Upper Reciever Black 10.5 in