While more accurate than the Thompson, particularly in semi-automatic mode, the Reising had a tendency to jam. This was in part due to its overly complex delayed-blowback design. This design used a system of levers within the receiver to release a fragile firing pin that could break, rust, or freeze in the humid jungle climate. Another problem with this form of delayed blowback was the recess in which the bolt lodged when in battery. If this accumulated dirt or fouling these could prevent the bolt from seating in it properly; and if this happened the trigger disconnector automatically prevented firing. In addition, the magazine was a staggered-column, single-cartridge feed design, and slight damage to the feed lips or debris in the magazine would render the magazine unusable. A partial solution to the magazine problem was the later introduction of a single-column magazine that reduced the capacity from 20 to 12 rounds.