As you can see in my sig, I have a G17,serial # FX950 US. (Yes, just like that. the US is spaced away from the #s a little. Also has the Austrian proofs on frame and barrel.) Bought it with 2 factory non-drop free mags. Pretty sure it was a police trade in, seems like holster wear on certain areas of the frame. Anyway, it had the black internal parts (ejector) and the non-captured recoil spring with hard plastic guide rod. Any idea on value and age? No, not selling it, just want an idea. I had considered a frame upgrade so I can use all the cool slide-on gadgets (light, laser,etc) but now I'm not so sure.