FX M3 to touch or not to touch

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Barzor

Member
Dec 27, 2021
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26
Manila, Philippines
I bought a 2 year old M3 last week it’s still shooting great 22 cal 25.39gr heavy pellets 40fpe sd 4. However, I noticed first time I shot, the first shot was a bit low velocity then all the others is perfect. So I dry fire one shot before shooting. I also noticed that there seems to be a tiny leak sometimes maybe I line in 48 hrs. I would fill the gun to 210 bar and in couple days it’s 200 bar and it would stay there a not move at all. Or like the other day I fill to 210 and its 2 days and no movement. I hate when something is not perfect.

I have feeling that the white oring on the valve rod is having issues, maybe changing shape as I cock and de cock the bolt. I really want to change the orings on valve rod and plenum nose and also polish the valve rod.

However, others tell me if it’s not broke don’t touch it until there is a big leak. Last night I tried using a leak detector liquid to see if there is other leak causing my issues and also to justify opening up the M3. But to my bad luck I found nothing. I tried all the usual places, there are lots of videos on it, but no leak.

I just want to survey what people think open it up or leave it alone. Lol
 
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My two-year-old M3 .25 has air quirks, too. Regulator One developed odd pressure swings but Regulator Two held steady so no effect, problem self-corrected. Sometimes, with sidelever back, say when removing magazine, faint air leak can be heard by plenum, stops with sidelever closed. Rare occurrence that doesn't affect gun operation, so I live with it. WM
One slow shot is the best you can ever hope for no matter what you replace or polish. Losing 10b after a fill is almost standard after things cool off because filling causes heat. Leave it alone but keep a little list of things you’d like to do. The gun will eventually develop an issue that absolutely requires you to tear it down. Then knock everything out. Poking an Impact with a stick unnecessarily can go sideways quick.
 
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YIKES!!!! Early Onset FXitis.
If you are happy with how it is shooting a pellet you are happy with, just shoot it and enjoy it.
You may not even have a leak. It could be that you are filling the bottle too fast and the air is heating up and then when it has cooled down you are at a slightly lower pressure.
The forums are loaded with people who have issues with their FX guns. A large percentage of them have FXitis. The constant urge to screw with a correctly performing gun.
Nothing wrong with tinkering if that is what you want to do. That is how we learn. BUT, do not blame the gun for your own inability to leave well enough alone.
These are the words of a rehabilitated sufferer of FXitis.
 
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I would leave it alone. The pressure drop you see is likely the air cooling over night. I see this a lot in Louisiana. A temperature swing will cause the pressure to change 10 or even 20 bar. This is even more pronounced when using a compressor to fill you gun. The compressed air heats up while filling. Then the air in the bottle cool after sitting for a while.
 
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My two-year-old M3 .25 has air quirks, too. Regulator One developed odd pressure swings but Regulator Two held steady so no effect, problem self-corrected. Sometimes, with sidelever back, say when removing magazine, faint air leak can be heard by plenum, stops with sidelever closed. Rare occurrence that doesn't affect gun operation, so I live with it. WM
 
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