5 ESSENTIAL ELEMENTS FOR COLT M16A1 FOR SALE

The M16A2 buttstock is about 5/8" of the inch extended then the earlier styles.  Due to greater length it employed a longer buttstock screw and a spacer.  The swivel is mounted closer into the buttplate. This buttstock is at the moment utilised to the M16A4:    The "C" about the barrel would suggest a chrome chamber only barrel. But AFAIK, Colt