On my newly acquired Saigas, I'm going this route with my new S12s.
Before doing any mods, I test fired the shotguns with various low brass ammo that I had from WalMart, I didn't have any of the 100rds value packs. I typically buy the Federal 6 & 7½ Game loads for 3-Gun matches anyways for my Rem 11-87. Both of my new S12s ran fine with the gas port set to 2 with my various Federal and Winchester ammo.
a. Sent out my bolt carrier, bolt, and fcg to be professionally polished and reprofiled. Also doing the left side charging handle.
b. Since I'm adding weight to the carrier with the