Just a little un-textured model I made a couple weeks ago.
Nice! Are you going to post the model?
BTW, is the cock (I mean the thing on the top…is that the right term?) separate from the main part?
i think you mean the ‘slide’ … 
Yeah, it’s separate.
… given the detail on the side of the gun, you can work more on the top side … it looks a little plain right now …
Your model is really flat-looking from side view. Also, detail on top is horrible (high-poly? are you kidding?). You have to make shape of the pistol better- it looks like modelled from cube.