Originally Posted by
vintage
bought it used off of ebay, 4000 series serial number, not a scratch on it other than on the barrel. put my asa and hose on it tonight, aired it up and it ran for a few shots then I got a low pressure type sound(hard to explain) waited a second it ran some more then did it again and then the trigger just flat wouldn't pull. degased the marker, gassed it back up and it repeated the process again. if the gauge on the side of the asa is correct it has 1100 + psi from the bottle. I noticed when aired up the sear rod touches the back of the trigger, could this be the problem? I don't think I was short stroking it.
Whenever you buy a new mag, the first thing you should do is replace all of the orings. That way you know the proper ones are installed and in good condtion. If you use good quality synthetic light oil, they will last for many many years without any issues.
If the trigger rod is touching the back of the trigger it needs to be adjusted. It should be about a credit card thickness from the back of the trigger when the trigger is held against the safety with the gun aired up.
The sound you are hearing is probably the burping sound caused by a weak bolt spring. Replace the bolt spring and the problem will probably go away.
Except for the Automag in front, its usually the man behind the equipment that counts.