My first PCP 850 airmagnum (need help)

[dk1677]

Did you have any CO2 in it that you removed? The seal can get cold and leak, ( let warm up) could be a bad tank, cheep one?  a drop of pelgun oil or better yet MAC1's mix on the top too.

[daveb50]

The valve o-ring is probably the culprit. You can replace it with a #112 Buna N O-ring 90 Durometer, 1/2" ID, 11/16" OD, 3/32" Width.

[TutorN1]

I got a new 12gr adaptor the other day, is anyone else using one of these? Got one because I can fine the 12gr cans easy around here. What I'm running into tho is very so often it's not punching through both cartridges, I've tried the penny in the middle.

[Bullit]

Did you get the 9oz paintball adapter from B&A?  Dunno about the cheap ones.  A drop of oil is good for threading on the tank.   A new o-ring is cheap, no problem to fix...but it should work if the nipple is clean and the threads on your tank are good.   Never tried the 12g adapter, as it seemed an expensive way to go.

[TutorN1]

I didn't buy it, was part of a trade when I got the rifle. It's the one made by Uramax for the 850. 
Was going to use it for the time being till I can find or build a wood target stock to fit the 9oz can. Got a big peice of ceader sitting behind my shop.

It works well, when it punches both cans. Plenty of power, and doesn't leak down. Just wonder if anyone else might run one of these?