I had an idea for a new gun a few days ago, and I really think its possible if someone puts some effort into. It might not be cost effective, or useful, but I think it would be cool. A self-loading revolver (a semi-auto/revolver hybrid). Basically my idea is its a revolver on the outside, but you can insert a magazine into the pistol grip. You also load the chambers like normal. So after three shot have been fired, and there are now empty chambers, the gun automatically starts feeding rounds from the magazine (in the pistol grip) into the empty chambers. You could have a... I don't know, 15 round capacity revoler? Obviously I'm not an engineer, so I won't be designing this. But if any of you want to go ahead and try, be my guest. I expect 10% royalties on all sales, though.