Man Cave Machine Ltd - Thompson M1A1 with a 1928 bolt, barrel and Cutts compensator. Also kept the floating firing pin to eliminate out of battery blow outs. Wood work next and
Cutts Compensator
Choosing a Thompson: What Collectors Should Know - Small Arms Review
Thompson cutts compensator
Why was the muzzle brake/Cutts compensator removed from military versions of the Thompson SMG? - Quora