You don't need a new gun. Ions are great guns, I played with mine for CFOA all season last year, and so did the rest of the team. All your stuff is good, just get a new pack. You'll want a barrel (cp 1 piece is great and affordable) and new feedneck. The rest is up to you. Just practice against teams that are better than you, you'll find that gear really doesnt matter at all.
edit: forgot to mention ELBOW AND KNEE PADS are a must! eclipse makes the best stuff.
you guys got the stuff. u need a paint sponser,cause at mark's you can't afford paint for cfoa he charges way to much that will be you guys biggest problem hands down. which is gotcha laser tag. come out to mccoys and see how we do it and you want be sorry. theres no way you guys can practice cfoa there and be ready
find a team that already plays CFOA and practice against them...better if you can find a team that is in a higher division that you...you may get your ***** handed to you but ask question and dont get discouraged about loseing to them