Long story short, I have two SX2s that have been the biggest POS shotguns ever regardless of how well they are cleaned..
Last year I purchased the Sure Cycle kit and mag kit and put it in the 3 inch gun.. To my surprise they would not cycle even the hottest loads with the heavy spring and performed marginal in the field with the light spring..
So recently I decided to have the piston sealed at the recommendation of Jeff and the positive feedback of folks on here.. Upon receiving the gun back I installed the heavy spring expecting the worst, and much to my surprise bang bang bang everything I threw through it in the yard from 2 3/4 high brass lead to high speed steel..
So I hunted it four times this week with flawless performance.. Than today the weather struck, snow, rain, sleet and a disced field with rivers running through the layout blinds..
While my girlfriends M1 was a single shot and another buddies BPS was completely seized, The SX2 was shucking shells 20 feet with mud in the action.
I was gonna take this gun to failure with the upgrades, but with the conditions today I will clean it and be 100 percent certain of the reliability.