I bought one of the DM engines from HK and it was used has 2 cylinder bolts sreipped a gas in the cylinder and you can see where they ground the DLE off and ingraved the DM and ground on the piston and rod to remove the markings. I am still fighting with MC and they reversed charges and changed there mind and re charged me and them refunded and now have changed there minds again, seems MC is afraid to stand up againts the chinese.