Need critisicm? OK, I can help. So, is it a gun? Where is the trigger? The ring near the scope doesn't look good, you can delete it, if you cant connect it. Shouldn't the scope have any glass details? It doesn't look like a real gun. Did you use any reference? One more thing, how much time have you spent modeling it? 10, 20 minutes? I have discovered one very important thing, modeling takes time... I mean, don't rush with modeling when you are learning.
If you want to learn, you shuold first learn all the comands, tools and functions from the Edit Polygons, Polygons, Edit NURBS, and Subdiv Surfaces menus, from the time i leart them i feel pleasure while modeling, you will see, yuo will too
. Work slowly, but get good results.
Now say what you think abuot my work, please.