Ah, the A5. By far, my favorite shotgun. I have one. A Belgian one (FN made), 12 gauge "light twelve" model, 26.5 inch vent rib, full choke. I use it to shoot skeet and sporting clays, and it's such a good handling gun that I average as well as most skeet shooters with their short barrelled wide open chokes, and when
I smoke the clays, they just turn into a little black puff of smoke and drift off.
You don't need two friction rings. You change from light to heavy loads by changing the order of the parts, that's all. The instructions should be on Browning's website. I can't remember exactly which way is what, because mine is set up for light skeet loads and I never bother it. I have learned that a little oil
on the mechanism is all it needs. Too much is as bad as too little. A few drops will satisfy the needs of the whole gun.
The mechanism in that gun is ingenious. I particularly like the fact that you can drop a shell in the open chamber by hand, it falls to the bottom on the feed ramp, and when you hit the bolt release, it NEVER fails to properly chamber the round. It almost doesn't seem possible.
The only thing I can fault it for is if the forearm stock breaks, it can cause a very serious gun jam with a live round stuck in the mechanism. I've seen it happen. The feed ramp
gets stuck partway through its travel, and live
shells are still in the mag tube. A trip to
the gunsmith for repairs is highly recommended.
Inspect the fore stock from time to time for cracks.
CJ