Rare Colt M16A2 SMG 9MM New in Box with Original Accessories.  These are quite rare, especially new in box.  There are only 47 of these in the ATF registry.  The X Prefix identifies it as an experimental gun.  From the collection of a retired Colt executive.  Note  the SMG receiver stamp. This is the final designed version of the SMG with stainless hammer and trigger pins and is one of the last SMGs to have a collapsible stock. The Colt model number is RO635. Few Collectors have ever seen one of these $31,525