I thought about that, but researching the problem I heard SO much good about Wolff that I had to get one. It'a a lulu, and feels like a tube spring oughta. I just wanted to get the info out there in case anyone was thinking about buying a used one. Mine's a 590, 9 shot SP (now that the spring works) blue with shield and "accessory" lug. The bolt is NOT blued. Guess it's reasonably new, it looks BRAND NEW and the forend is as one with the charging arms. That means post 2008 manufacture or something? Mossberg hasn't responded to emails asking about YOM. It's T282xxx SN.
I had been looking for a Mav 800 when I saw this 590 for like 100 bux more than a Mav. I pounced.
"If I've told you ONCE, I've told you a thousand times... DON'T PROVOKE THE BORG!"