Lots of rifles ended up rebuilt, Primarily Vietnam era rifles. Usually the barrels had been changed. Some examples of markings found on replacment barrels include: In terms of observing an inexpensive priced m16 or xm16 magwell which is salvageable, I’ve been periodically seeing sales since June and not too long https://messiahdecax.law-wiki.com/1080390/how_colt_combat_elite_commander_45_acp_can_save_you_time_stress_and_money