50 BMG Caliber upper for AR15, 36" barrel

This upper, manufactured by Blackthorne Products, is designed to fit a standard Mil Spec AR15 lower. Simply remove the bolt catch, buffer and spring from your lower and install this single shot 50 BMG Caliber upper. The match grade barrel is machined from Chrome moly 4140 steel, heat treated to 36 -38 Rc, 1-15 RH twist, 36" long and is of a medium weight contour. The full length of this 36" barrel makes the most of this powerful cartridge. The barrel muzzle is threaded 1-12 TPI and features a recoil reducing muzzle brake. This muzzle brake is machined from bar stock and is so effective it reduces the recoil to that of a 12 ga. shotgun. The upper receiver is machined from ONE PIECE of bar stock, no castings or weldments here! The Chrome moly 4140 steel is heat treated to Rc 44 and coated in a fine manganese phosphate finish for corrosion protection and good looks. The upper receiver is topped with an M1913 Picatinny scope rail with oversized heat treated socket head cap screws for no-movement and easy scope mounting. The massive bolt head is of a 2 lug design, with a 90 degree throw. This bolt is machined from bar stock, like all the major components of this upper, from 4140 chrome moly steel and heat treated to Rc 44. It has an integral extractor and ejector and incorporates important safety features such as gas vents and hammer blocking cam to ensure safe operation. The aluminum handguard completely free floats the barrel for enhanced accuracy. This handguard is machined from aircraft aluminum and hard coat anodized for long life. The deeply knurled surface affords a sure grip. The upper comes as shown in the LOWER half of the picture. The upper half of the picture shows the upper assembled on a lower. The lower half, scope, and bipod are NOT included, just the upper assembly.