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Arms-Cool post in Chinese(along with the first Youtube video), also mentioned that while RA-Tech provides the "150%" spring for the recoil spring, its still not strong enough for the heavy slide. So the OP in that thread found a combination of springs available to him that upped the rate more. The RA-Tech's own vid you can kinda see the the sluggish nature of it...
Also RA-Tech's vid doesn't exactly state the the BBs used or the the temperature....in Taiwan they don't exactly use central heating in winter, it can be 15-20 C indoor...
Heavy slide should not affect outright FPS of the gun, but it may well affect shot to shot power as the gas reservoir size is limited(MK23 though does have a big mag), and heavier slide takes more gas to cycle(after the BB has been expelled), which will have more cool down, and more % variance in reservoir pressure....
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