Stay with 14", don't go above that. DO NOT EVER UNDER ANY CIRCUMSTANCES FOR ANY REASON GET AN 18" BARREL. As Buddha3 says, buy a bigger pack. Currently I carry a 9 and a football. 88/4500 or 114/4500 tank is a nice thing to have too. Stock Angel barrel is good, as is a DYE SS or Ultralite. Personally I'd say if you want a lot of different bore size options, get a set of straight bore, single piece CP barrels rather than a Freak because they're simpler to clean, cheaper, and allow for 14" of straight bore rather than just 5", and they're much more gas efficient, and even slightly quieter.
Communication is critical. Learn to be very specific, very descriptive, very fast, AND VERY VERY LOUD. Repeat yourself until understood every time and you hear teammates repeat what you say....less than that is unacceptable. Be constantly aware of the task of picking off bunkering attempts made on your forwards.
Lay enough paint and taunt opponents while doing so to make shooting lanes one way streets. Shoot at edges of bunkers where opposition is likely to come out, alternating sides to keep them from snap shooting you, and when they are sticking out try to shoot at the nearest point of them to the bunker because that is what stays out 100% of the time they are visible, that is, the point at which you will have the most time and the greatest likelihood to hit them. Edges, edges, edges. Say it over and over again and practice it till it's all you think about. From that basis, memorize all the edge points of every bunker at the field, so that you can learn to multitask, meaning that upon every time that you come out to shoot, you immediately shoot at one and upon sight of another player coming out to shoot you, you have paint on him before he can get you..... add on as many as you can to that, practice it, and you'll be able to hold down the entire field and nearly take them out all by yourself.
