Aero Precision APAR501107C: Some time ago, Aero Precision looked a little different. They didn\'t start as a household name, but with great support and hard work, they\'ve grown into one. To honor how far they\'ve come, Aero Precision reflects on their past with the limited-edition Heritage Lower Receiver\'s. With Aero Precision\'s original logo, they pay homage to the early days, when life looked a little different, and they were only just beginning their legacy. Aero Precision\'s AR15 Gen 2 Stripped Lower Receiver is the perfect base for your custom AR15 build. Machined to mil-spec dimensions, their lowers work with standard AR15 components and ensure the highest quality with a correct component interface. 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, Gen 2 Nylon tipped tensioning set screw