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This a a Palmetto State Armory 10.5" Black Nitride A2 1:7 Twist Carbine Upper Assembly. Built by PSA and made in the USA!!
Barrel Length 10.5"
5.56 Nato Chamber
1 in 7" twist
.750" Gas Block Diameter
**Upper may or may not have T-marks
Does not include BCG or Charging Handle
Check out this product on my website! http://www.battlecreekarmory.com/product-p/psaua5564.htm