I just bought a T68 Tactical Sniper Paintball gun. Here's a link to the gun---http://www.rap4.com/paintball/os/paintball-tactical-sniper-p-4336.html. I also added the laser sight and the remote line to it. It comes with an 18 inch barrel but I want to upgrade it to a 20 or 22 inch. My question is what barrel would work best with this gun, and what type of paint will give me the maximum performance?