This 10” assembly is chambered in .223/5.56mm heavy profile barrel and machined from 4150 chrome moly Vanadium 11595E steel. It is chrome-lined in bore and chamber for long wear and ease of cleaning. This assembly features Mil. Std. 1913 Rail Gas Block (Picatinny).  The black manganese phosphate finish protects against rust and corrosion. It is button rifled at 1 turn in 9 inches – right hand twist for optimum accuracy. The muzzle is threaded 1/2” x 28 T.P.I. to accept a variety of flash hiders or muzzle brakes.