This review covers the Brownells Retro 4x20 Optic, a faithful reproduction of the original Colt 4x optic made in Japan. It highlights the optic's historical accuracy, including its unique adjustment mechanism using a cartridge case and a BDC turret calibrated for 55-grain .223 Rem ammunition up to 500 yards. The review demonstrates its performance on a BRN-601 rifle, confirming its value for retro builds.
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