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I do not have access to Colt 1911 schematic with dimensions but I understand that the space allowed for a compressed recoil spring is very close to 1 - 7/8 inches. When I compress the recoil spring I use in my Gold Cup, which has 26 coils . . . (with all coils touching), the compressed size...

I have a variety of 1911 recoil springs that have been acquired over the years. The only 1911 pistol I have at present is a Mod 1969 National Match Colt (45acp, of course). I notice that some have 32 coils, some 26 and some 28 coils. I have crafted a set up to measure the resistance...