HK MR556 5.56mm NATO 16.5in Black Semi Automatic Modern Sporting Rifle – 30+1 Rounds – The same grade steel used in making cannon barrels — is used for the rifle barrel. Using the famous HK cold hammer forging process, this advanced technology manufacturing produces a barrel that provides superior accuracy and long service life. It is also moderately “swagged” with a slightly smaller internal diameter at the muzzle end than the chamber end. This has a positive effect on bullet accuracy and velocity and the thick, heavy contour MR series barrels also contributes to its precision.
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