The M16A2 buttstock is about 5/8" of an inch for a longer period then the sooner designs. Because of the increased length it used a longer buttstock screw as well as a spacer. The swivel is mounted closer to the buttplate. This buttstock is at the moment used about the https://webdirectory7.com/listings12967339/indicators-on-gold-cup-trophy-colt-45-you-should-know