Murdoch has it correct. A warped cyliner will result in a loss of compression and so a loss in FPS.
The FF teflon cylinder is great. I have one in my APS2 Type96. Ive put a load of shots through it and its still in perfect condition. Initially you may notice a bit of teflon will come off. I noticed when I cleaned the rifle the first few times that the lube had what I thought was a bit of teflon in it. Eventually this should dissappear.
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