45 AUTOMATIC COLT CARTRIDGE/MANUFACTURED BY/COLT'S PATENT FIRE ARMS MFG. The remaining receiver markings all remained intact as follows: "CALIBER. 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 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 "5188" below the marking block.
To affect this modification the standard receiver markings were carefully 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 on the barrel and the 1927AC model (like this example) that has the Cutts Compensator on the barrel. They are still tracked with their original serial number. There were only a few hundred of this model actually manufactured/converted by the factory on a permanent basic, and they are considered very scarce. With all the interest in these weapon 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.
Originally these started out as a standard Colt Model 1921 fully automatic SMG firing the standard 45 ACP round. This is a very rare variant of the high desirable Colt Model 1927AC Thompson that was factory (Auto-Ordnance) modified to "Semi-Automatic" fire only.
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