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Originally Posted by appa609
I recently bought a guarder sp 110 and 120 to upgrade my guns to 360 and 420 fps respectively. When I got them though, they didn't feel any stiffer than my stock m90, and when I put the sp 110 in, it didn't shoot as hard either. The 120 might aid this, but it certainly doesn't feel much stiffer. I noticed that the 120 has 35 coils while the 110 had 29.
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Could the springs have been mislabeled? It isn't uncommon..... If you look at the spring chart it says this as a note after testing:
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King Arms M100 spring tested must be mispackaged from the factory. The test results yielded were exactly the same as the M90 and the springs even appeared to be physically similar.
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However the fact that you have a different number of coils makes it seem like that might not be the case. Do you have another gun to test the springs in maybe? Also how are you testing the new speed? If you're doing the coke can test that's not a good test at all, and if you're using a "visual" guess that's also not very good either. You should really use a proper chrono or at least doing the poor mans microphone chrono.
@Behnken: I have no clue, and searching google doesn't give me any info but I would assume that if they offer a 90% gearbox that's designed for CQB and therefore probably around the 330 mark. So my guess based on that is that you're probably looking at the 400-420 mark with a "150% gearbox" (just my guess based on the info given, this is not to be used as actual advice).