Upper half, .22 Long Rifle, M4, Free Float

AR15 / M16 A3 .22 LONG RIFLE Upper half with 16" M4 contour barrel and A3 Upper receiver. Item # AR-UH22M4FF. This .22 long rifle barrel is 16" long, threaded the standard 1/2 x 28 tpi, and has an A2 flash hider with the correct crush washer. The barrel has a hard coat anodized front sight base with M1913 Picatinny rails on all four sides for easy accessory attachment. It has an aluminum free float forearm that is knurled for sure grip and completely free floats the barrel for increased accuracy. The barrel is machined from chrome-moly, high vanadium steel and hardened to a U.S. government Mil-spec of Rc 26-32. The barrel, and all external steel parts, are manganese phosphate finished IAW 5.3.1.2 of Mil-STD-171, the U. S. government's recommended protective finish for steel. This finish not only looks great, it affords complete corrosion protection. These barrels are of Mil-spec M4 contour (.750 under the front sight base) complete with the M203 groove in the front. The barrel is button rifled with 6 grooves, right hand, 1 / 16" twist. The 1/16" twist is best for 22 LONG RIFLE because it handles the widest variety of ammunition and bullet weights. The barrel is mounted on a polymer A3 upper receiver with built in Mil-spec M1913 Picatinny accessory rail. The upper features a sling attachment point in the forward assist. This upper comes complete with an Electroless nickel plated 22 LONG RIFLE bolt/carrier assembly for complete corrosion resistance and provides a self lubricating ability as an aid to reliable function. Also included is a charging handle. This upper INCLUDES a polymer 30 round magazine (see item # AR-A-93). The upper is fully assembled, headspaced, and ready for action and fits on any MIL SPEC STANDARD LOWER RECEIVER.