Colt Confirmed Proof V&P in triangle marking on remaining facet from the barrel among the legs in the entrance sight foundation: Sad to say, I'm on travel so I can't article images in the bolt. It is actually MPC engraved. The one marking around the provider is the "C" stamp https://gunnerqfyit.mappywiki.com/1087610/top_guidelines_of_colt_combat_unit_rail_gun_45