Tippmann 98 Hammerhead Fin Bore Barrel Sizer - 0.686 Optics/Flashlights/Lasers By being able to move

By being able to move faster

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Quick release thumbscrews for easy attachment/removal

most consistent firing cycle possible

the better the display gets

Tippmann 98 Hammerhead Fin Bore Barrel Sizer - 0.686 Optics/Flashlights/Lasers By being able to moveHammerhead Fins (Sizers) are designed to match the ball size to the barrel. The type of ball, weather and manufacturers tolerances can all have an affect on a paintball size. To optimize your barrel performance it makes sense to have the right sizer for the ball used that day. HammerHead Fins are 2 in length which is an optimal length based on the amount of air pressure that occurs during the first two inches of a ball being shot out of a paintball