Ok, I just got my saiga-12 a couple weeks ago. Shot 5 rounds of wal mart fed low brass 7 1/2 shot target/field through it at normal speeds, then i fired 5 shots as fast as i could pull the trigger. worked fine..... i ordered an md-20 drum for it and the md arms v-plug. put it in on the +(low brass) setting and tried the md-20. Stovepiped every round.... I tried adjusting the v-plug a couple diff places but didn't help. haven't tried it with the factory plug. I have 3 ports, one partially covered by gas block. I don't get why it worked flawlessly with the factory 5 rnd mag but not the md-20. th