Marc, Yes, several things wrong with that parts kit. The compensator is a Type II, likely not the correct compensator for that gun based on the history documented by Gordon Herigstad. Good call on the barrel threads showing, I have never seen that either, especially on a Type II compensator on a Colt gun. Of course the flattened pin and visible barrel thread are suspect, indicating a reblue. Couple that with the fact that the person manning the table at the recent Ohio Gun Collector's Show earlier in May, while myself and another Board member were examining the parts kit, volunteered that the barrel and compensator had been reblued. The longer pieces of the receiver where it was cut appear to have been polished on the edges and the serial number on the small piece appears to have been overstruck with the character "9". Nice call on that, Arthur. The wood and metal wouldn't look like that on a gun that had been with the Marine Corp in Nicaragua, either. Regarding the early Auto-Ordnance logo, vs the later style, recently examined guns in the 4900 plus serial number range exhibit both type logos appearing nearing the 5000 range which used to be the accepted standard. I find the early grip frame markings and squared actuator slot unusual for a gun in the 4900 serial number range as well, although anomalies have been noted over the years. For example, St. Valentine's Day Massacre 1921A Model # 2347 has a a squared actuator slot but has later Full Auto/Single fire select markings and horizontal lines on the receiver for Fire and Safe.