KAC SR-16 CQB E3 11.5" (USSS) Upper with Sandcutter Bolt Carrier and MAMS. This upper is marked "COMMERCIAL". I'm open to trades on other Knight's items, specifically looking for SR-15 IWS Lowers. Also open to HK Roller Guns or 416 Upper and LMT goodies and Tactical Bolt gun setups.