.44 Magnum : A Legendary Gun - Modeling Task

Olá,
This is a Smith and Wesson .44 Magnum Gun. I wanted to practice hard surface modeling, before that I did some research on how the shapes & volumes define this Legendary Gun, it was fun!!
Modeling done in Maya and rendered out in Arnold, done basic shading just wanted to check smooth polygon surface.
Please comment if you have any suggestion.
Thank You!