I have a clone, Stevens 5100 in 20ga. I believe, but may be wrong, that the 311 is the early model and after a couple of minor improvements they changed to 5100. I can say it's a nice little gun though, very handy, but mine has developed a trigger problem, it likes to discharge both barrels with one trigger pull. Probably a worn sear, but potentially dangerous. I paid $100 for mine so it's worth fixing in my mind. I do believe there were some store brand clones as well but I can't remember the store. Sears? I hope this helps some. If you find one, I think they're worth buying, good field gun.