Ben-3000

Love the design. Looks exactly like a real weapon. It has a good feel. Compact yet functional.

Looks quite light and for an energy weapon this can be a boon if their is no kick back.
If their is a kick back. I recommend beefing the frame up to give it more heft.
Textures are simple but look great. Nothing to flashy but that's exactly the way a good weapon should look.

Button/switch placement are great. Very functional and i can see the purpose of each of them without having it spelled out.

Now for the other stuff/Input (It's short I promise)

Depending on the way output looks. How bright and flashy it is. Glow sights might be a waist. As they will be overpowered with ever shot limiting their effectiveness. (If it's dark enough to need them. A bright shot would leave the user temporarily blinded.)

With such a thin narrow frame It has the sense it could snap if used wrong.

Needs to be fleshed out more. Give us details. It would be nice to know what kind of weapon it is. Laser pistol? Plasma? Another form of energy? What is it output compared to say a 9mm? Better or worse? What is it's capacity? A lot info would be a great boon. This can also help you improve your art as you have a desired purpose and can build it around that.

That's all I have for now. Love the looks of it.