Check out John Whiscombe's guns, the JW 50 through 80, I believe. Custom, hand made springers that use an opposing piston design that makes them truly recoilless. Lots of other features, so far out of my league I don't even know all the goodies :-). One was recently posted on the Yellow Forum classifieds for $4500, I think it sold in about 10 minutes. I'm afraid John has taken his last orders, I think he has some in the works now, but then he's done. So if you want one, better haunt the classifieds. Later.
Dave