I have a Classic that I bought off Craigslist. Hadn't been used in years, but it seemed to work ok. For the heck of it, stuck an Air America Black Ice reg bottom housing on the back of the valve. Reused the piston, adjuster, spring pack, and reg seat from the Mag. (I know reusing the reg seat is a no-no, I was just curious at this point.) Lo and behold, it works! Awesome. Just to be safe, I fully rebuilt the gun with an AGD kit, then added CCM fittings and a hardline, and it still worked fine.
Problem #1: Today I went to target shoot, and I can't get more than .5bps. It takes more than half a second for the trigger to "click" back. If I pull the trigger immediately after it finally returns, it farts at me. (Aside, is this what chuffing is?) It takes a second or longer before it recharges enough to actually fire a shot at full velocity. There's an audible hiss that seems to be coming from inside the valve while it's recharging. If I crank in the adjuster, velocity goes up but doesn't improve cycle rate. I switched back to the original Classic valve back thinking that might be the problem, along with a new reg seat, but no change. After cleaning out the on/off a few times, cleaning everything, staring at operating animations, and generally fiddling for an hour and a half, I gave up and went in to hang out with my toddler. ("Daddy sad because paintball gun is bwoken." That's right, kid.)
Problem #2: It's been a good 5 hours since I degassed, pulled the trigger a few times, removed the tank, and hung it on the wall. Thought maybe I'll try cleaning the on/off again? Pull it off the wall, pull out the field strip screw, pull the trigger to make sure the pin doesn't catch, and slide the valve back. Scared the poop out of me when the on/off pin comes loudly rocketing out the fieldstrip hole, ricochets off my leg and makes the radiator ring nicely. I thought Mags degas pretty thoroughly? Am I doing something wrong, or is there something wrong with the gun?
I can only assume one of you is going to say replace the number whatever o-ring and it'll be perfect, and I'm going to feel like a moron, but better to feel like a moron and have a working Mag than the opposite.