Dave Grimshaw, Sig Sauer's Rifle Product Manager, introduces the new SIG M400 rifle at the NRA show. This AR platform rifle features a direct impingement system, distinguishing it from the SIG 516's gas piston. Key features include M4-style furniture, an A2 pistol grip, a removable 0-600 meter rear sight, an adjustable front sight, and a 1-in-7 twist, chrome-lined barrel.
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