Gen 2 Improvements Upper Tension Screw - Allows users to fine tune the fit of the upper and lower receiver through the use of a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver. Increased Magwell Flare - Allows for easier insertion of magazines and provides a sleeker look. Includes: Stripped AR15 Lower Receiver in FDE Cerakote Nylon tipped tensioning set screw SPECS Specs Shipping to FFL Dealer Required Yes Made In America? Yes Platform AR15 Material Machined from 7075-T6 forged aluminum Finish Magpul FDE Cerakote Markings "Cal Multi" Compatibility Works with standard AR15 components and magazines Weight(s) 8.35oz Other Rear takedown pin detent hole is threaded for a 4-40 set screw