Looking up some detailed AKM photos, I found an interesting take down photo spread comparing the VE to the Glock semi. The guy ran 1000 rounds through the Sigma and recorded the jams of various types. I think the Sigma fared well considering he used 1000 rounds of Wolf steel case. Wolf is my ammo of choice in an AKM, but I had several issues with Wolf 9mm in my 9VE. Unknown to me until someone posted on this forum awhile back, there's a good photo showing the cotton damper in the return spring as well. the website is: guerrillagunsmith.com/Sigma.htm