Quote:
Originally Posted by BBS
if you are adding a 650mm barrel, you might want to consider a "bore-up cylinder" kit to reduce the suction like back pressure.
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If you're going to 650, a bore-up kit isn't so much a suggestion as a must. Without it, you'll most likely be getting terribly consistency between shots because of the suck-back, which will affect your effective range MUCH more than an extra 200mm of barrel will.