I'll add this here, a double post more or less from the other thread.viewtopic.php?f=53&t=438029
sawfish, the OP there gave me the idea.
I have a 30-inch bbl Lt-12 that is "stiff". It needs a light setting for buckshot loads and on the light setting has issues with 7/8 and 1 oz loads. I have spare friction rings from my Mag-12 so I just replaced the Lt-12 BRONZE friction piece on the muzzle end of the recoil spring against the barrel ring and then placed the steel ring against the receiver, and tried it.
Bingo! Works great!!
Basically, it is kind of like what lowgun is doing, since the Mag-12 bronze friction piece is more or less half the width of the Lt-12 friction piece so it provides some braking, but "not that much" braking.
I'd much prefer doing this than running the gun on spring pressure-only, as with only the spring there is no braking effect when the barrel returns to the front of the tube/collides with the forearm, not to mention the lack of any braking effect when the action is opening up. The latter might be no big deal as it might be just fine if that's what it takes to function a certain load. Anyhow, maybe this would work for guys that want to shoot the really light loads.
And this all begs another question.
If a guy is shooting really heavy-kicking loads in a Mag-12, he might be able to add a Lt-12 bronze ring setup on top of one Mag-12 friction ring to add additional braking effect. Maybe, not sure, but it might be helpful for guys with a "loose" Mag-12, especially older guns with chopped or vent-ribless bbls.