First thing to do is change the battery; the voltage reading that you are getting is not the same as the amount of charge in the battery. This is what is required to reliably operate the marker.Lol yeah I remember, but just put the batrery on a tester and its reading 8.7 volts ie nearly full, also the sfr has been lowered, the one on the side that alters the speed of the bolt, its at about half travell, wondered if that made a differance?
I striped, cleaned n greased it and it seams to be fine now