How much are you looking to spend? If money isn't a issue, you should look into a STIFFI 1piece barrel or a Dye Ultralite with a .691 back. If you are limited on money, go with a Custom Products 1piece barrel. Great for the price.
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I got a whisper on my A-5 it shoots pretty good for a cheap barrel. I have a empire 2 piece on my cocker and that shoots great. For woodsball go with the whisper but if you want to play tourny or airball go with the empire. The whisper is very quite so it was good for the woods. If you need more info IM on brokendreamskate.