Both look very good in terms of structure. The only thing I would maybe change is the colors, though it’s just a personal preference. I would think it would look better to have darker colors, rather than the bright ones you currently have. Though, it depends what kind of game you are making, and how the colors fit the aesthetic. All in all though, it looks great. Keep up the good work.
Honestly, after like 3 hours in the making(because as the post has said, these are my firs Guns), I just wanted to get these things rendered and call it a job well done. But now that I see it, it could look better. Thanks!