THE BASIC PRINCIPLES OF COLT COMBAT UNIT RAIL GUN 45

The mag release button had a horizontal line sample on it, compared to the round line sample located on the current types, see the image below for an example:Regretably, I am on vacation so I am unable to publish photographs of the bolt.  It is MPC engraved.  The sole marking on the provider could be the "C" stamp about the still left aspect.  T