Asomodai Posted December 11, 2018 Share Posted December 11, 2018 Hello all. I was looking into improving the compression of my JG SL8. It has a 509mm barrel. Some people say that you get a little percentage increase in FPS with a bore up kit, but you need a 509mm barrel or more to take advantage of it. However most bore up kits I see have a ported cylinder, which you usually wouldn't use with a barrel over 400mm. So what gives? Why have a bore up kit with a ported cylinder? I would like to purchase the Guarder G36 bore up kit, but the cylinder is ported. Link to comment Share on other sites More sharing options...
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