Build your next custom AR-15 with an original Colt factory upper fully finished and ready for installation. Made from a high-quality aluminum alloy forging machined to precise tolerances for correct fit on Colt lowers and clones. Hardcoat anodized for added surface strength, abrasion resistance, and corrosion protection, with a uniform, matte black finish that matches other factory components and easily accepts alternate finishes. These are “stripped” receivers (except as noted below), so you can select the bolt assembly, carrier, gas key, and other components to suit your specific needs. All models designed to accept spring-loaded ejection port covers. Carry Handle Cl Mfg: Colt SPECS: Aluminum, hard anodized, matte black. Fits standard Colt AR-15 lowers and clones with .250″ pivot pins.