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Old 10-20-2012, 11:58 AM #1
Join Date: Oct 2012
PMR 07 Back cap problem. PLEASE HELP!

First I am new to the forum and hope Its ok I posted in this section I am new and need help lol.

I got a PMR 07 about a week ago. It worked great when I bought it. When I got home I took out the bolt to do maintenance on it. Lubed it up and put it back together. When i put the bolt back in I lined up everything and screwed it back in. Screwed on the HPA tank and it was leaking, then I heard a pop. Took out the bolt, I busted the Air valve oring on the manifold. Replaced it, now the bolt does not screw in all the way and there is a slight leak out the back cap. To me it looks like the back cap isn't screwing in all the way, BUT ITS TIGHT! and wont screw in any further. If I take the back cap off the bolt. The cap screws in all the way just fine. NO THREAD DAMAGE......

What is wrong with my PMR 07?
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Old 10-20-2012, 12:03 PM #2
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Try lubing the threads. Maybe they have started to get crossthreaded even so slightly.

Other thoughts: Any debris in the bolt kit? maybe a chewed up Oring on the inside of the can?
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Old 10-20-2012, 12:07 PM #3
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I lubed up the treads, made sure there is no debris inside anywhere. It just doesn't want to go in any further. I don't understand because when I bought it it worked fine..All I did was standard maintenance...
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Old 10-20-2012, 12:27 PM #4
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This may sound obvious but were you using a replacement o ring from a kit sized to your particular marker? If it's one size to small then yea, it can cause issues like air leaks. And are positive that air is coming out of the back cap and not the air release port on the back?
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Old 10-20-2012, 12:39 PM #5
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Im not sure where on the back its coming from. But there shouldn't be a constant air leak out the back right? I know when you fire it a little should come out. I read the manual but a constant air leak shouldn't be there. Correct?
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Old 10-21-2012, 12:10 AM #6
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Correct. I would guess that you put to big of an o ring on to replace the one that blew. If I were you I would order a rebuild kit from O Ring monkey for your year of PMR and just rebuild the whole thing and lube it.
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Old 10-21-2012, 12:18 AM #7
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If possible try posting a picture pointing to where exactly the air is leaking from.
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Old 10-23-2012, 04:14 PM #8
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This might sound stupid but is it the stock plastic back cap ? They are prone to crossthreading and breaking. I would recomend a metal one if it doesn't already have one.
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Old 10-28-2012, 10:05 PM #9
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Yes, they are prone to having issues, and replacement backcaps are like the #1 necessary upgrade that's actually an upgrade.

#2 would be a Dye Feedneck collar to replace the plasitc one that came with the marker from the factory

#3 would be trigger, CP and others make great triggers that make it more snappy and feel better in your hand


#3 upgrade to an ultralite frame, it's hourglass shape feels better in the hand and it's all metal, but don't be fooled by the name, It's heavier then the stock frame (should be called a heavyweight frame

All or at least most sites have backcaps, some on clearance and you should have no problem finding them. my favorite one is the hybrid traitor cap, second is the modified backcap, but NDZ is the cheapest but still better then stock. Good luck with your pmr, it will last you for years.
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Old 10-29-2012, 10:39 AM #10
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loved my pmr when it wanted to work.

just make sure all your orings are the right size and arent broken. lube the bolt good but dont over lube. and make sure the can part of the bolt is screwed on tight. also, make sure that oring on the bottom of the bolt doesnt get pinched when putting the bolt in. that was always why my bolt didnt wanna go in right

as said above, a metal backcap is basically necessary. the plastic one will eventually strip out if you do regular maintenance. but if you treat your pmr well, itll do the same for you and last for years. like i said, i loved mine, but ive upgraded since

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Old 10-29-2012, 11:23 AM #11
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If you plan on looking for a UL frame, be prepared to not find one. Each UL frame is different in shape and from what I remember, UL's are meant for a specific gun/year. Not to mention, Dye doesn't make them anymore except for the ones that come with the guns. Maybe they still have some PMR 08 UL frames left over, probably not though.

But yeah, sounds like you crossthreaded the backcap. Just get the aluminum one off of any site. I believe the 07/08/09/10 all used the same backcap. I don't know about the reflex/rail backcaps.

Here are some backcaps. They range in price from $10-30 and are all made out of aluminum so they all should be the same quality (although the finishes may differ). That hybrid backcap looks pretty cool, toolless entry is a nice feature although I was sometimes able to get my stock 09 PMR backcap off if it wasn't tightened too much.

Last edited by masterofTHUMBS : 10-31-2012 at 12:26 AM.
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