The biggest difference between the 4040 and 4013 is the frame material. The 4040 was the first Scandium framed Semi-Auto in a 40 cal, and maybe the first scandium semi-auto (I could be wrong on that). The other big difference is that the later 4013s were double stack and early ones were single stack. The 4040 is single stack only. My 4040PD is one of my favorite pistols (that and my 1066). Also, note that none of the 4013 magazines will work in the 4040.
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J.D. Roy
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