Designed from the ground up to provide shooters with functionality that benefits their skill set. UTG PRO billet 7075-T6 receivers feature shooter-focused ergonomics, rigid reliability, common parts compatibility, and a lightweight overall design perfect for the basis of your next build. Specifications for UTG Pro AR15 Billet Upper Receiver: Manufacturer: UTG Pro Color: Black Finish: Anodized Fabric/Material: 7075-T6 Aluminum Caliber: Universal Gun Make: AR Platform Gun Model: AR-15 Hand: Right Features of UTG Pro AR15 Billet Upper Receiver Features forward assist and T-marked 14 slot picatinny flat-top M4 feed ramp cut Overall lghtweight with dehorned corners and melted contours Package Contents: UTG Pro AR15 Billet Upper Receiver 1/16 Hex L Key User Manual What firearm models does the manufacturer say UTG Pro AR15 Billet Upper Receiver is compatible with? The manufacturer says that UTG Pro AR15 Billet Upper Receiver is compatible with AR-15