I just picked one up too, did the same thing and didn't cycle and upon inspection I found the the shock washer (what was left of it) had kind of oozed down the magazine tube and gooed everything together. I cleaned it up, replaced the washer and still no luck. Them I noticed it said 3 inch for shells and I've been using 2 3/4 shells. Will it cycle with 2 3/4 shells? or must I use the 3 inch. I have to tell you this is my first S&W shotgun so I need to be educated on this.

Semper Fi.

HavocUSMC.