A surprising-albeit subtle-variety of fixed polymer buttstocks were used on early AR-15/ M16-series rifles. There are five basic types; although it does not appear that these ever received unique manufacturers' designations. Collectors today know them as Type A through Type E. These stocks were fitted to the Colt Models 601 through 604 and later rifles. The Colt 601 was fitted with both Type A and Type B stocks. These are seen in either their unfinished state-a red-brown color with visible mottling caused by the bulk filler material in the resin-or in a finished state with either a green or black paint. As with the later Types C and D, these were foam-filled for rigidity and featured a rubber butt-pad and a sling swivel that pivoted on a split pin. On the earliest Type A stocks, the sling swivel could fully rotate; however, these were quickly changed to the more common split pin and are rare today.
展开▼
