Some years ago, I had a Springfield Defender which went full auto on me at MCRC. It had an 8 rd magazine, but I was able to get off the trigger after 3 shots in spite of my complete shock and surprise. Needless to say, it went to the smithy, posthaste. Daniel, you may remember this; this was the same gun in which later, the barrel lug separated from the barrel itself.
It is a cool looking gun, even if it is impractical. I used to be a big fan of the "Able Team" series of Mack bolan knockoffs, and remember Carl Lyons having what he called a "Frankencolt," a GM which had been modified in the same way as the Beretta 93R; enlarged trigger guard, fold-down grip in front of trigger guard, and a selector allowing for either semi or 3 rd. burst capability. Something along that line might have some practical but very limited applications.