Great write up. Thanks to this forum for all the info. My Saiga would not cylce low brass, etc. I tried the MD V-plug and puck and still no luck. I noticed one of the gas ports was partially block by the block. Removed the block which was rather easy and filed away, also drilled the three ports to 3/32" why I was there. Polished the bolt carrier and hammer with my demmel. Took it to test today and it eats everything thru the stock and Surefire Mag. The Promag I have sucks!! Thanks again for this write up for the DIY peeps!!