This a a Palmetto State Armory 16" Black Nitride A2 1:7 Twist Carbine Upper Assembly. Built by PSA and made in the USA!!Barrel Length 16" 5.56 Nato Chamber1 in 7" twist Carbine-length Gas Black Nitride Finish.750" Gas Block Diameter M4 Feedramps Forged Upper **Upper may or may not have T-marksDoes not include BCG or Charging Handle Although we do carry several different Bolt Carriers and Charge Handles to complete your upper. To do this you would simply select which BCG & CH you want to be shipped with your upper plus you will save money buying them together.