Foxtrot Mike is well known for its innovative 9MM PCC, as it has been a go to for competitive PCC shooters and consumers alike, for more than 6 years. The Foxtrot Mike Products AR-15 Gen 2 Upper Receiver is a premium quality upper receiver designed with several innovative and patent-pending features that make it one of the most innovative AR-15 uppers on the market. The integrated, proprietary recoil system allows for the upper to function without the need for a lower with a buffer tube, making it a great option for AR style firearms, that incorporate a folding or collapsible stock. The Foxtrot Mike Products Mike-15 Gen 2 Upper Receiver is available in 5.56/223 Wylde and feature Mfg: Foxtrot Mike Products