Hey, Delta.
I'll just give you a little C&C, if you don't mind.
Now, I just started learning how to model guns for actual use about 2 weeks ago, so I'm pretty much a novice, but I know that pistols anywhere above 2,000 polies is far too unoptimized. This one I've started on here is about 780 polies:
If you really want me to be honest, your pistol looks a tad blocky around the grip area, and you're barrel is has way too many polies. If you really think about it, the barrel won't be seen hardly at all, and it will be the farthest away from the camera. The grip just takes inspiration, because I was told the same thing on my first gun, and I found a solution with Blender's techniques.
Also, I can't tell without a wireframe, but if you modelled the barrel and breach fully, or any other internal parts, they're not necessary. When a gun is shot in real life, the slide moves extremely fast, so the eye barely catches its motion. You could make the animation faster, and have a very basic internal mechanism.
If you ever need any advice or help, I will be more than willing to help you.
System: Windows 7, 2.5 Ghz Quad-Core, 1 TB HDD, 8 GB RAM, ATI Radeon HD 4650 | My Superheroes: bond1 and Errant AI