 Wartime production variants had a fixed rear sight without the triangular sight guard wings and a non-ribbed barrel, both like those found on the M1/M1A1.In addition, the Soviet Union received M1928A1s, included as standard equipment with the M3 light tanks obtained through Lend-Lease.The weapons were never issued to the Red Army because of a lack of .45 ACP ammunition on the Eastern Front; they were simply put in storage, although a picture exists of what appears to be Thompsons being used by Russian M3 Stuart crews in the Caucasus.