Aero Precision APAR502501M66: This AR15 Complete Upper features a 20\" 5.56 Rifle Length Barrel with Pinned FSB and Magpul MOE Rifle Length Handguard. This complete upper DOES NOT include a BCG and Charging Handle. Upper Features: Upper: Standard AR15 Upper Receiver Barrel: 20\" 5.56 Rifle Length Barrel w/ Pinned FSB Handguard: Magpul MOE Rifle Length Handguard Gas System: Rifle Length Gas System Muzzle Device: Standard A2 Flash Hider