My assigned weapon was the M2 Carbine. At the time I was then 5’10+” 145 lbs of rompin stompin airborne hell. The few “burp guns” were usually assigned to deuce and half and 3/4 ton vehicles. They were also used in combat patrol probes. I couldn’t control that damm thing except use it as a broom as in a sweeping action which was effective . I might have done better if it was assigned to me but thats (your weapon use) pretty good shootin.
yes, the main problem with the tin can gun was that it was very hard to control and required much practice. If it is any consolation I was 5’8” and weighted 147:) . With trigger manipulation you could get off single shots. I was able to hit man sized targets 10 out of 10 with it using single shots at 100 yards.