Just finished replacing all the springs and associated small parts in this Belgian-made vent-rib 16ga Auto-5. Going to hit the trap range again and see if it does better than last time. This was a project I picked up for cheap, maybe ten years ago, and just didn’t know what to do with. The stocks were too far gone, and too short to salvage properly, so I added a 1” Pachmayr pad and just cleaned them up. I think it may already have been modified for modern shells, but I had a buddy machine a tapered cone at the chamber throat anyway. It seemed capable of reliable operation the last time I had it out, but the recoil felt excessive, and the hulls wanted to just dribble out. Hopefully it does better this time.
If anyone has an up-to-date Big Book or specialty FN/Browning book handy I’d appreciate more details, since I don’t know much about this particular trim level. The serial is in the middle 78,000 range. Barrel is 28”.