I bought my a5 used a few days ago, and it worked great. I then took it apart to polish the internals, and when I put it together I noticed that it leaked pretty bad...The air pretty much all just came out of the barrel. I suspect it has something to do with the valve, but I really dont know. Also, when I took it apart again I happened to lose an oring (its the tiny black one) and I have no clue where it would go. I guess that could cause the leak, but I doubt it....Any help here guys?

Take it apart one more time, then re-assemble it. Inspect each part separately and fully. Reassemble, using My assembly video, and see if that helps.

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The small o-ring probably belongs on a banjo fitting.

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A-5, APE 2.0 board and E-grip, Rhythm Innovations Mag trigger, TechT Squishy Paddles, TechT Vortex Mod, TechT QEPH, TechT Lightening Rod, GTA LPK, PPS Fatty Stab, JCS Gold Power Tube, MadDog Spring Kit, PPS 12" Single Vent Brass Barrel, PPS Apex Adapter, BT Apex, Hogs Den Rubber Grip

if thats where the oring came from, (banjo fitting), than it wouldn't be leaking out of the barrel. There is always the "Washer first, Then O-ring" saying too.

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The small o-rings are from the banjo fittings. He can still be leaking out of the barrel and be missing a banjo o-ring.

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A-5, APE 2.0 board and E-grip, Rhythm Innovations Mag trigger, TechT Squishy Paddles, TechT Vortex Mod, TechT QEPH, TechT Lightening Rod, GTA LPK, PPS Fatty Stab, JCS Gold Power Tube, MadDog Spring Kit, PPS 12" Single Vent Brass Barrel, PPS Apex Adapter, BT Apex, Hogs Den Rubber Grip

Did you try cocking the the gun before airing it up?

I got my gun brand new and for some reason if I dont cock it before I air it up it leaks like crazy out of the barrel...

I know this is not normal but I could never figure why it did it ... I have all upgraded internals now and it still does it.

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Setup:
Olive Green A5 with Super RT.
Flatline/Spec ops C-series with Apex
LPK with Palmers stab. Stab is mounted on Lapco Offset rail. Libraty M4 Collapsible stock

Stock Invert Mini with Spec ops C-series w/ Apex

I agree. Cock the cock the gun before gassing up. They say to do it in the manual as well. Sometimes the air won't cause the valve to seat because the hammer is pushing the pin forward too hard. Cocking it will take the pressure off the valve pin.

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Cock the gun before you gas it up and you shouldn't have any problems. Like Lord Odin said, the Rear Bolt is resting against the Valve pin causing the Valve to be open and let the gas flow right out the barrel.

The small black o-ring would go on a banjo fitting.

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maybe you have over polished the internals so then thats why it would leak out of there, i read something about if you sand down the a5 to much then bad things would happen so i dont know. just a thought

Nope, Thats a Myth. Everything happens in the powertube, so he is safe in that aspect. Check to make sure your tombstone is properly attached, and that the oring that seats the tombstone in the powertube is not damaged. Alot of times its a cracked or split oring that goes unnoticed that causes problems.

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