The M16A2 buttstock is about 5/8" of the inch longer then the sooner models. Due to amplified length it utilized a longer buttstock screw plus a spacer. The swivel is mounted nearer to your buttplate. This buttstock is currently utilised within the M16A4: Is it an actual Course III transferable https://bookmarkworm.com/story18458892/the-2-minute-rule-for-colt-combat-unit-rail-gun-45