For 3rd gen pistols, the model number tells you:
first two digits = calibre, ie, .40S&W
third digit indicates type, 1=compact pistol
fourth digit indicates material type, 3=aluminum alloy frame with stainless steel slide. If it was a 4014, it would be an aluminum frame with carbon steel slide, and the entire piece would be finished in blueing, not the stainless look.
A compact .40 has a 3.5" barrel, 8 shot single stack mag, Novak lo-mount fixed rear sight with two white dots, fixed post front sight with white dot, ambi safety , bobbed hammer, and it will be a traditional double action ,ie, the safety lever decocks the hammer and puts the gun on safe, first trigger pull is long and heavy double action, you are cocking the hammer and then firing, subsequent trigger pulls are single action, shorter and lighter.
I have a 3913 and a 3914, basically the same except in 9mm, and like them a lot. 4013 should be desirable, though maybe a little snappy, given the light weight (27 oz.) of the pistol, don't know, never fired one.

__________________
Ed