The M16A2 buttstock is about 5/eight" of an inch more time then the earlier models. Because of the increased length it used a longer buttstock screw and also a spacer. The swivel is mounted nearer on the buttplate. This buttstock is currently utilised around the M16A4: Up for sale is https://manuelmymxf.bluxeblog.com/63420810/the-2-minute-rule-for-colt-combat-unit-rail-gun-45