The M16A2 Buttstock is about five/8" of an inch more time then the earlier types. As a result of amplified length it used an extended buttstock screw and also a spacer. The swivel is mounted nearer for the buttplate. This buttstock is now used within the M16A4: I have viewed https://socialmediastore.net/story19053147/colt-combat-elite-commander-45-acp-for-dummies