Critic (beginner)

How can i improve?

Much help needed.

I’m presuming this is a gun.

The metal textures are really good, and it looks properly worn.

Think the modeling can be improved. The gun looks like it would be difficult to hold.
The grip at the back looks too small. It seems to have to barrels. But from the way it is
positioned they do not look hollow. It also looks like it would be difficult to take this gun apart.
The small copper screws miss the slits or crosses. The bigger copper nuts seem to to have too many sides.

Assuming the thing on top is a laser for targeting. Maybe have a laser beam coming out of it?
Maybe also add an opening where the empty shells are expelled from?