This video provides a detailed historical overview and technical breakdown of Colt's AR-15A2 series firearms, released between 1984 and 1988. It highlights the evolution from the SP1 models, incorporating changes from the M16A2, such as updated stocks, pistol grips, barrels with a 1 in 7 twist rate, and the introduction of features like the forward assist and case deflector. The series covers various models including the R6400, R6401, R6500, R6420 carbine, the HBAR R6000, the 9mm carbine R6540, and the R6520 government carbine, detailing their specific modifications and market positioning.
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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