You must be leaking somewhere or else have an o-ring that is swollen, blown or missing. Air up and listen for leaks. The manifold o-ring is my first suspect. I have a 2010 PMR and nearly every time I pull the bolt out that guy gets cut. I check it every time I service the gun. If it's cut on one side, I flip it over until the fresh side gets cut and then replace it. Also check your bolt o-rings and replace any that are shredded, nicked or broken. The ones on the bolt tail can be your problem. You vent gas out the back cap when the gun fires and the bolt returns but it's only a tiny bit normally. It acts kind of like a QEV. If those tail o-rings are gone you will dump a lot more air out the back cap than you should. There are several small holes around the perimeter of the back cap that the air escapes through so you may not notice it when firing the gun since it doesn't produce a big puff of air. If you don't have a rebuild kit, they go for around 25-40 dollars new and are well worth having. You can find deals on the nation for o-ring kits. I just picked up 2 o-ring kits that sell new for $60 and $120 off the nation and spent $40 for both of them. Pretty much any Dye or Proto kit is going to have what you need. Most guns have a lot of o-rings in common so if you got a big kit with a lot of different sizes you will probably find what you need. If you find that you need just one or 2 o-rings go to your local Ace Hardware and raid their o-ring collection for the sizes you need. Everything in a PMR is 70 hardness so standard hardware o-rings will work fine. What lube are you using? I use Dow33, hater sauce, monkey poo or militia lube on everything I have. Don't use an oil in your PMR for anything. Any of the lubes I just mentioned will work well in your PMR.
This past weekend a 10 year old boy was at the field with some friends and his gun was leaking like a sieve. The staff wanted to charge him to fix his gun, but he had just enough money to cover field fees and air. I overheard the conversation and he and I sat down at a table and spent 30 minutes going through his gun. I didn't even have his gun (DP G3) and had never worked on one before, but my collection of o-rings from various sources had everything needed to get him running and gunning again.
Last edited by rkenders : 01-26-2012 at 06:15 AM.