Originally Posted by HotxRod
I would check your Hyper2 reg and make sure it holds a steady pressure. (No drop or creep) As far as maintenance goes, just keep the orings clean and lubed.
Keep a fresh battery in it and it will treat you right for a long time.
As he said, if the dm4 has been sitting a while with no use I'd go ahead and get a oring kit and rering the bolt. other then that...
check regs like he said lube them.
check LPR/lube it make sure the LPR seat is in good condition along with the 010 oring on the brass adjuster.
and make sure the on/off is in good condtion too