I have been having the exact same problem. I have had my saiga over a year. i had it converted by a gun smith. Used to shoot 6 shot like a champ. Now I have been having problems. The last time it worked I shot 00 buck on gas setting #2. Now all it does is jam. Gave it a good cleaning still jam. Did the cleaning with the paper clip in the gas port ans stills jams, BTW i only have one gas port hole.
Any help would be helpful!
Thanks