I have a 2011 Saiga 12. I bought a new MD 20 from Mississippi Auto Arms. The drum fits well after filing with no rattle and I haven't adjusted the spring tension. It loads and cycles low brass well. But with the Winchester Super X High Brass, pictured below, after I put the drum into the gun and let the bolt move forward to load the round it fails to load, it gets stuck on the round and the round fails to move out of the magazine. I tried these high brass rounds with my factory mag and 10 round mag and they load fine. I emailed MD Arms last Friday but haven't received a response yet. I