As the war developed, engineers found ways to simplifying the Thompson, and later M1 and M1A1 Thompson submachine guns were easier and less-expensive to produce. Watch our "American Rifleman ...

Assembly is so simple, even I was able to transform my 10/22 into a Thompson M1 in less than an hour. (Scott can do it in 10 minutes.) And because no permanent changes are made to the host 10/22 ...