Awesome work
Anyone who's hassling you about the rifle is fucking blind, or they don't realize that artistically this is probably better than some generic fanart with a "technically correct" rifle. This rifle really works for the style of this piece. One thing I notice in this and some of your other works is you have a very distinctive lighting to your art. You have a lot of range as an artist, so all of your pieces seem to have their own unique style about them but your excellent sense of dramtic and artistic lighting seems to be the hallmark of your work.