It worked well but due to the war effort was found expensive for mass production and its weight defied the concept of a light rifle.
[1] The only major differences from the Light Rifle and SMG was the barrel shroud which housed a quick barrel change device similar to the MG42 and pressed steel components to ease production and reduce weight.
The Thompson Light Rifle was more reliable and accurate than the M1 carbine that was adopted and also came with the capability of select fire, which made it close to the likes of the StG-44.
Auto-Ordnance also submitted two other models not based on the Thompson SMG for tests in the .30 Carbine competitions in May and June, 1941.
[2] The modified version tested September, 1941 was semi-auto only, had 80 parts, and was found difficult to disassemble and reassemble.