So I bought a half blocked Trilogy to convert to a pump, but after messing around with it, I think I may keep it mech for awhile. I added a CP reg today, and it seemed like every 4th shot was around 205 -220, while the first three were 270 ish. Also, I don't know if this is common with half-blocks, but after the bolt is released, it pushes air out of the back around the bolt ? Normal ? Lastly, I am attempting to rebuild the valve, what type of orings do they normally take, the ones on mine appear to be urethane orings about the size of tank orings, maybe smaller, where can I find replacements ?