Reising M55 Submachine Gun
The Reising M55 submachine gun, developed by Harrington & Richardson, was adopted by the US Marine Corps during WWII to supplement Thompson SMGs. While lighter and firing from a closed bolt for accuracy, it suffered from poor corrosion resistance, a dirt-sensitive delayed blowback system, and non-interchangeable parts. The M55 variant featured a folding stock for paratroopers and tank crews, differing from the M50's wooden stock.









