Tiger Rock Upper Receiver AR-15 Billet Black Small. This sturdy lightweight upper is machined from a solid block of 7075-T6. The forward assist has been removed and several cuts reduce the weight of this upper. If you are looking at parts for a new build or to increase your performance from your firearm the Mod 1 is the only upper you need. Specifications for Tiger Rock AR-15 Billet Stripped Mod 1 Upper Receiver: Manufacturer: Tiger Rock Color: Black Gun Make: AR Platform Gun Model: AR-15 Condition: New Magazine Included: No Features of Tiger Rock AR-15 Billet Stripped Mod 1 Upper Receiver Billet Aluminum Slick Side No Forward Assist Low Profile Brass Deflector Flat-Top with Picatinny rails Mil-Spec dimensions Package Contents: Tiger Rock AR-15 Billet Stripped Mod 1 Upper Receiver What firearm models does the manufacturer say Tiger Rock AR-15 Billet Stripped Mod 1 Upper Receiver is compatible with? The manufacturer suggests that Tiger Rock AR-15 Billet Stripped Mod 1 Upper Receiver is compatible with AR-15Tiger Rock 223UP-BILLET: Upper Receiver AR-15 Billet Black Small