That's right what Yeoldetool says: Do not put oil on any parts in the gas tube. Make sure the bolt carrier groups is clean and oiled so it slides easily, and the bolt turns. Basically any metal-on-metal sliding contact. My experience with the AK platform was in combat, where we cleaned and oiled them every day and didn't fire as many rounds as you might do in a competition. As for the the Saiga-12, make sure you use the type of cartridge ('shotgun shell') where the nose (the other end from the brass) always curves toward the centre. Some makes of cartridge have a little flare at the end.