This is a factory colt 10.3 inch upper. This has the factory quad rail but I am including a surplus KAK quad for you purists. PRI gas buster charging handle. Surefire SOCOM 3 prong flash hider. It has been pin welded on to allow a front vertical grip on a pistol lower. It has a Magpul MBUS Gen2 rear backup site. This is new, unfired with the Colt box the upper came in. Charlie's Custom clones gets $2400.00 for an upper similar to this one. I have other KAK covers, front broom handle, LMT rear sites, Military grip-pod available for extra. No trades please. Need cash for other project. Pirce is firm. Located in Canyon Lake and must meet close. Text me and I will call you back. Bob 8three o481278one