I have had a S&W Model 1000 shotgun since 1984. I bought it new with money from a summer job. I have put many thousands of rounds through it in practice and while hunting upland game. It has the 2 3/4" chambered barrel. I have only had a problem with it not autoloading once. It basically turned into a single shot. It took me a long time to find the problem. It turned out that the magazine tube that the piston rides in had gotten loose and rotated slightly. This did not allow the gas holes from the barrel to properly line up so that it could actuate the piston when the gun was fired. Once I corrected that condition by tightening that tube back up, the gun has fired and reloaded correctly ever since. Just my 2 cent. YMMV.

Tom