The M16A2 buttstock is about five/8" of the inch more time then the earlier types. Because of the improved duration it applied a longer buttstock screw plus a spacer. The swivel is mounted closer for the buttplate. This buttstock is currently utilized to the M16A4: The barrel is usually a https://colt-combat-unit-rail-gun91233.eveowiki.com/1087959/the_2_minute_rule_for_colt_python_6_for_sale