I used to help a friend out in the spring with his snow goose outfitting business and the #1 gun that his clients had issues with was the Winchester SX. I did this for about 4-5 years and brought out hundreds of clients and I saw more jams/cycling issues with them then all the others. They are probably fine under normal conditions but, laying in the spring mud in a layout blind with a 10shot extension tube was not good for them.
I have had one since I was a teenager. I have never once had it malfunction or give me any issues. Personally I take fairly meticulous care of my guns and they get cleaned and oiled regularly, but when hunting I don't take it easy, from busting brush for upland to muddy PNW waterfowl season it has seen some abuse.
My buddy has one, doesn’t clean his gun often, and I’ve seen him issues with it.
I cleaned his gun for him once on trip when it was acting up and it started cycling correctly again. His idea of cleaning is a few drops of rem oil once a year.
I think if you take care of it you’ll be fine. If I ever seriously duck hunted again that would be high on my list of potential guns to get.
SX3 has a great reputation. My brother has one and loves it.
I bought an SX4 last year and have loved it so far (although the knock on the SX4 is that it has cheaper components than the SX3 - so far I have had no issues at all with my SX4).
I’ve had a SX3 for years and the only issue was replacing the recoil spring. It’s been my absolute favorite shotgun and wish I could find another new one to buy.
Weird, Ive been researching this as well, and scouring the forums, it seems, the only issues anyone has with the fn slp, sx, sx2,3,4 etc is with the 3.5" versions? I care nothing about shooting 3.5" again and if I do I have a few other shotguns that can shoot the 3.5" but I really try not to see a need to lol.
I have had a browning gold 3.5 (pretty much a SX2) for ~24 years and I've got 10-15k through it. Never a problem except I had to replace a $5 plastic part about 7 years ago. I keep it reasonably clean but am not neurotic about it. That gas system is pretty simple/reliable.
My Browning Maxus 2 is legit. I believe it's the same design. It can get finnicky if you don't clean it correctly and let it gum up around the gas port/piston. It's taken a lot of Arkansas cold weather absue.
I've had an SX3 for almost 10 years in and around saltwater environments. The gun is incredible reliable and durable. Several other people I hunt with run them as well. The gun is also surprisingly light in the hands for upland hunting as well. If I ever purchase another shotgun, it will be an SX4.
I've had a SX3 12ga for about 12 years, I do not clean it and I've oiled it less than a dozen times. Probably around 300rds a year if I had to guess? I just bought a 24'' 20ga SX4 and its LEGIT also I love it for early squirrles and I've been shotgunning coyotes with it!
Both of mine run flawlessly, every time, so far, for me.
I've shot a SX3 20ga that has been through the Rob Roberts treatment and that thing is a blast to shoot ducks with! 0 issues over the last 5 years or so.