My first 3D rifle

I'm taking 3D max lessons!!! Although there are much more to learn, I've already made a rifle using what I've learned. I made this randomly, so there might be a lot of flaws in the design, not to mention the bad techniques, but, I'm just a beginner. However, there is one thing that makes this rifle special to me, it's how you aim this rifle. you can aim through the drum clip. Since I often only draw the side of a gun, I haven't much think of things that can only be seen from the front or back of the gun.

If there's any improvements in the future, I will refresh this picture.
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I know this rifle is impractical!!!!

The functionality is next to the appearance and feel when I'm designing,
so there might be flaws.

Wider barrel version uploaded!!!