Guntec USA AR-15 9mm Complete Upper Receiver Combo Kit Black

Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit Black. 3 in Package Contents: Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit What firearm models does the manufacturer say Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit is compatible with? The manufacturer says that Guntec USA AR-15 9mm Cal Complete Upper Receiver Combo Kit is compatible with AR-15GUNTEC USA GT-UPPER-9-KIT: Ar-15 9mm Cal Complete Upper Receiver Combo Kit Black