Its about time for a big washington war. My marching band is performing that day so it doesn't look like I can go. If you have another war anytime in the future I would love to go. If there was any way you could move it to the 17th I bet I could go and bring along another guy or 2.
If you used CPVC or possibly 1/2" PETG or Brass you might be able to pull off 13-14" for a small boost in range because it is slightly smaller than the regular 9/16" or 17/32" in diameter. The only problem is that you will have to use thinner darts, too.
If you are talking about a single barrel I would say they are about the same. But if you are thinking of leaving turrets, the 2k will get much larger ranges, with a lower ROF.