If you want it locked some of the time and not locked for certain games, you may get away with a programmable mosfet, such as a burstwizard.
Got it. I have an old Version 2 gearbox, so I'll practice on that Jcheese before doing it on my primary. I'll also check out the MOSFET.
non perm? if its an m4.. dot of glue on the selector? nail polish remover when you want to go auto. 1+ for burstwizard
Will have to go with permanently then. Thought you would be allowed to have a gun locked to semi not stuck on semi.