Update:
I took the gun to fighter town for a few games on sunday, it performed perfectly in the 70 degree weather. Charged with propane it was consistently shooting 360fps with propane and .25's so about 402fps w/ .20's.
Unfortunately after about 20 magazines into the game, I started getting misfires a lot, and every so often a mag would just vent its entire contents out the ejection port instead of cycling the bolt.
After a while it stopped firing altogether. I retired it for the day after I discovered this little surprise:
The nozzle had been all smashed in, as well as the little arm that chambers the round.
So I ordered a replacement piece, this one made out of steel, awaiting on its arrival.
This is definitely not the gun for someone who wants something cool but inexpensive. With the cost of the new bolt which is on its way here, I've got a little over $1000 invested into it and I've been cost consciously shopping around.