Hehe, I've had a go. It's very fun once you get into it. I can see why you make so many! It has come out a bit small but I think it is ok for a proper first try!
(The actual gun image itself I was GFXing from had a basic shell so don't blame me on some bland areas
)
I think I might have made some mistakes with the shading. Please give advice.
If you can even see it. XD