I used my CT crossman shotty at an outdoor game this past weekend. Although it had enough range, it's accuracy from shot to shot is near impossible to maintain while running on a field plus the wind factor. Forget the fact that when you recock, you will not be pointing the barrel in the exact same direction to hit the same mark twice.
Pinning an opponent behind oil drums is possible. Taking them out when their head pops up near/almost impossible. This was at <150 feet.
I can't even imagine CQB'ing it with AEG's or GBB's. If it was an all springer CQB, then sure.