


The remaining receiver markings all remained as follows: "CALIBRE. The left rear portion of the receiver was originally "THOMPSON SUBMACHINE GUN" which has also ben milled off and restamped "THOMPSON SEMI-AUTOMATIC CARBINE".
#COLT MODEL 1927 SERIAL NUMBERS SERIAL NUMBER#
The markings were changed as following: the left side of the receiver was originally marked: "MODEL OF 1921" which was milled off and restamped "MODEL OF 1927", with the old serial number "4706" below the marking block. The standard receiver markings were milled out and remarked, and the internal components changed to semi-automatic fire only. There were two basic models: the 1927A model without the compensator and the 1927AC model (like this example) with the Cutts Compensator on the barrel. Although semi-automatic, they are still tracked/registered with their original (1921) serial number. There were actually less than 100-150 of the original semi-automatic models ever manufactured/converted by the factory and original unaltered examples are very rare. With all the interest in these weapons in the late 1920s, the Auto-Ordnance company decided to try and capitalize on their popularity by introducing a "semi-automatic" version available for sale to the general public or police that only wanted a semi-automatic weapon. Originally these started out as a standard Colt Model 1921 fully automatic SMG firing the standard. This is a very rare variant of the highly desirable Colt Model 1927 (AC) Thompson that was factory (Auto-Ordnance) modified to "Semi-Automatic" fire only.
