How about this....a select fire, well made, BB rifle.
Let me introduce you to the EAA Drozd Baikal BumbleBee.
http://www.makarov.com/drozd/
I've had a chance to fire one of these for a while Wasted about 200 rounds of BB's into a poor cardboard box. Sounds like an nail gun going off!
Let's just say I have one of these on order now!