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Lumatt, FWIW, I have personally seen '70 Series Gold Cups up into the 70N24000 range with the lightened slide. A friend has one in the 70N12000 range with the lightened slide. If it happens to be one of those, I'd definitely recommend a Govt./16# rcoil spring and buffer with standard ammo. I owned several '70 Series Gold Cups, none with the lightened slide, but all came with a recoil spring 4 coils shorter than the Government Model spring...