<p>Primary Weapons M116UF0B MK114 223 Wylde 14″ 4140 Steel Black Bbl Finish The MK114 upper is a gas piston system at a carbine length. It features a 14.5 inch barrel, and has key mod rails. SPECIFICATIONS: Mfg Item Num: 2M114UA0B Category: UPPERS Type :Complete Gas Impingement Caliber :223 Wylde Sights :Flip Up Barrel Length :14″ Barrel Material :4140 Steel Twist :1:8″ Barrel Finish :Black Receiver Description:7075-T6 Aluminum Receiver Finish :Black Handguard Finish :Black Barrel Length Range :13.00″ to 15.99″</p>