Mill Armory 5.56 NATO AR15 Upper Receiver. This upper features a unique M-LOK
Free Float Rail system. PMA uppers are built with the highest quality materials
and test fired prior to shipping.
-M4 Feed Ramp Flat Top Receiver.
-Black anodized mil-spec finished upper receiver.
-Feed ramps on the barrel extension and upper.
-16" 4150 Chrome Moly Vanadium Barrel.
-Phosphate barrel finish
-Chambered in 5.56 NATO
-.750" diameter at gas block
-1/2-28 Thread Pattern
-Steel Low profile gas block with carpenter 158 screws
-Carbine length gas system
-A2 Muzzle Device
-15" Tactical Free Float M-LOK Rail