The M55 Reising was an American submachine gun designed by Eugene Reising in 1940, entering service primarily in the United States Naval Department along side the M1928A1 Thompson. Chambering a .45 ACP cartridge like the Thompson, although with a lower magazine capacity, the M55 saw service with the Marine Corps during the early years of World War II in the Pacific Theater. The M55 was the variant of the M50 Reising equipped with a folding stock and a pistol grip, making it more compact and a full two kilograms lighter than the Thompson. It was eventually replaced by the Thompson and M1 Carbine completely, known for its unreliability (the stock folding while firing). In addition, the M55 was slightly heavier than the M1 Carbine.
Issued alongside the M1928A1 Thompson, the M55 saw service on Makin Atoll, arming Tommy Conlin, the Naval Aviator which the Raiders rescue and numerous other Raiders. The next appearance of the M55 Reising was at level Tarawa D, it can be found in the destroyed LVT-2. M55 has good accuracy and does a moderate damage, useful in close and moderate range, but it's ammo is not so common in campaign, and is better to swap for Thompson, M1 Carbine or Type 100.