Currently a black fusion with freak kit and evo 2 running compressed air.
None that i notice.
Out of the box ran about 500 rounds through it using 20bps with ramp mode on with an evo 2, very consistent super fast never broke a ball once then i threw my freak on it from my old cocker now its flawless. this thing shoots a constant stream of paintballs but so do all the high end guns but this one doesnt cost as much as the other ones.
The Fusion is a great marker I highly recommend the fusion for players that want a high quality high end gun for half the price of the others.