The M16A2 Buttstock is about five/8" of the inch lengthier then the earlier styles. Due to enhanced size it applied an extended buttstock screw as well as a spacer. The swivel is mounted closer on the buttplate. This buttstock is at the moment used to the M16A4: I say this https://waylonghfca.nizarblog.com/31469187/how-colt-combat-elite-commander-45-acp-can-save-you-time-stress-and-money