Smith & Wesson Mod. 1000
Since I asked here, I found out exactly what you said. Apparently there is an o-ring that goes bad. I didn't think the gun had o-rings in the gas system. I quess I haven't taken it apart far enough. I think I am on track to solving my problem. I appreciate your answers.
By the way, I have had this gun since the 70's and it has always been an excellent gun (until now). I love the way it handles and shoots. I shot with a borrowed shotgun this weekend and can't wait to get my S&W back on line.