This past year my research team (my wife and son) completed a very successful trip into the Thompson's past. Presented here are photos of some of the check gages and fixtures used to produce Thompsons at the Bridgeport factory during WWII. These items have never been photographed or seen since WWII production ceased. Enjoy!


To install the barrel on to the receiver, the receiver has a hole machined into it's face. The depth of this hole is critical to the headspacing of the chamber in the Thompson. This gage was used to verify that the correct hole diameter and depth had, been achieved.

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The gage must go in flush to the receiver face. Once this passed inspection, a tap was brought in to cut the threads in the receiver.