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Better in what way? More machinable? Higher tensile strength? AISI manual describes 5100 as being a chrome-manganese steel with excellent abrasion resistance. But the SAE manual says it is used for stamped tools like shovels and for bearings, so go figure. 4140 is described as a pre-hardened chrome-molybdenum steel best suited for forgings and stressed uses. Neither of those tell me much in the way of "how good the steel is". What I can tell you about the Norinco pistols is that they have a lot of porosity and they are not made to the 1911 spec (grip screw bushing threads are not threaded to the proper thread, the trigger tunnel is too narrow, the trigger bar tunnel is too shallow), and that when you machine them you find hard and soft spots. In these days of investment cast parts a little porosity doesn't sound too bad, but Colts were always famous for excellent finishes. Either way, the Norinco pistols are fair. And the roll mark on the side of the slide "Model of the 1911" always cracked me up
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