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Old May 12th, 2008, 23:59   #4
Naglfar's Avatar
Join Date: May 2007
Location: Ottawa
Tanio Koba makes barrels that have grooves in them, the idea being the surrounding air vortexes around the BB, so it doesn't hit the sides as much and is more accurate and consistent. They can only be used with springs under 320-330 fps before their effects start to wear off and become just any other barrel.
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