Finished:
http://s6.postimage.org/viw1odksx/gun6.png (Unsupported image host)

Finished:
http://s6.postimage.org/6qru3ee8h/gun5.png (Unsupported image host)

Edits on the first gun I posted:
http://s6.postimage.org/x6v730yoh/gunend.png (Unsupported image host)

I do not know how guns work in Graal but tried to do the charging ammo part.