Device and method for assembling submachine gun staff gauge component

The invention discloses a device and a method for assembling a submachine gun gauge rod component. The gauge rod component of the submachine gun can be conveniently and quickly assembled. Firstly, a gauge rod spring and a steel ball are sequentially arranged in a positioning hole of a gauge rod; the cylindrical part of the gauge slide seat is inserted into the center hole of the gauge; then, a gauge rod spring, a steel ball, a gauge rod and a gauge rod sliding seat are sleeved on a gauge rod sliding seat positioning boss of the base through a threaded hole of the gauge rod sliding seat, and are axially positioned on a gauge rod sliding seat supporting boss; then, the positioning section of the guide column is inserted into the threaded hole of the gauge rod sliding seat for positioning; and finally, the check ring is sleeved on the guide section of the guide column, then the pressing rod is pressed down with force, the check ring sequentially passes through the guide section of the guide column, the mounting