The M16A2 buttstock is about five/8" of the inch extended then the earlier types. Because of the elevated length it made use of an extended buttstock screw as well as a spacer. The swivel is mounted nearer into the buttplate. This buttstock is at this time applied to the M16A4: https://colt-python-6-for-sale67100.blog-mall.com/31815984/the-smart-trick-of-colt-combat-elite-commander-45-acp-that-nobody-is-discussing