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Shoot at trees? Tightbores aren't installed to increase distance or fps, only for more consistant shots. You might gain an extra 10fps from a tightbore, but yo ureally need to just set up a target 30-50ft away and make groups, aiming at the same spot. Comapre the stock barrel'd gun and the upgraded one for the tightest groups across like 10-20 shots. Only way to test if a tightbore is improving things.
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