In 1996,Mark and Chuck Larson founded Rock River Arms in Cleveland, Illinois. Rock River Arms soon developed a reputation as one of the finest builders of hand fitted custom 1911 pistols, NM frames, and slides set new industry standards for tight tolerances, fit and finish. They soon turned their manufacturing expertise and attention to detail into producing custom .223 caliber AR rifles. Their initial focus on tightening up tolerances and improving the fit, finish and reliability of their rifles was rewarded as the Rock River Arms NM A2 Rifle quickly gained popularity among high-power shooters. The company is producing a full line of custom rifles, parts and accessories, all built with the same focus on providing the finest fit, finish and function at a reasonable price. Rock River Arms remains committed to continuing to provide its civilian, law enforcement and military customers with the kind of custom products and services on which its reputation has been built.