The RISE Armament 20-piece AR-15 Lower Parts Kit has all the pieces you need to assemble a lower receiver with quality parts. The Lower Parts Kit features all of the working components of a lower receiver, minus the trigger. It is compatible with mil-spec AR-15s.
Most of the mil-spec parts featured in the RISE AR-15 Lower Parts Kit are made of the industry-standard 8620 steel. The 8620 carbon steel is a full-up alloy of nickel, chromium, molybdenum, with 0.2 percent carbon. It machines cleanly and is incredibly tough and strong. These properties make it perfect for the parts in the Lower Parts Kit. Meanwhile, the Safety Detent Pin and the Takedown/Pivot Pin Detents are made of yellow zinc. The pieces in the RISE Lower Parts Kit are highly wear resistant and are able to withstand the wear and tear of continuous shooting.
Many of the parts in the RISE Lower Parts Kit feature a black phosphate finish. The black phosphate finish deposits an inert layer on top of the steel to prevent the corrosion reaction from reaching the steel. The black phosphate finish also provides corrosion protection from extended shooting. Black phosphate finishes can be commonly found on drywall screws, frame bolts, and more. But what about what you actually get? Below is a look at the parts in the kit, with the number of parts in parentheses.