Originally Posted by sonixr7
Hello Dukie and fellow DRV owners, I have been shooting my DRV in my backyard and have not experienced any major problems.
I have a chronograph and was getting 270FPS on my first shot and then each consecutive shot the FPS got lower than the previous shot.
I am using a 10" stock Rainmaker barrel but I am unsure about the inner diameter. I am shooting Ultra Evil paint that measured between .678 to .682.
Do I need to use a overbore, underbore or paint to barrel match?
Will underboring increase my FPS on the DRV?
On a side note, I do love my DRV. I think it is the most fun I have had ever shooting a paintball gun/marker.
If you underbore to much you may chop paint. You might be able to underbore a little bit with Marbilizers but I wouldn't try it with Evil since it's really brittle.
I would just paint to bore match and see how that works. If you're still getting low fps ask Dukie how to do the hammer spring mod.
Edit: the more I think about it, even if you underbored and didn't break paint all the air would probably escape out of the sides of the cylinder.