I rarely see people try to mod an AICW prototype gun or an OICW prototype gun. I haven't seen anyone try to draw a Singaporean weapon - the SAR-21
http://world.guns.ru/assault/as31-e.htmOr perhaps you can think of your own imaginary gun. Try to picture it, then create it. Or better yet, you know how to draw the G36/M16 well right? Why not mix their parts up?
Imagine a large shotgun with a scope and an extra box-magazine underneath it called the Jet Rifle - a hybrid of a sniper rifle and a shotgun. A sleek sniper rifle with this round chamber where the bullets are held - like a revolver. A Soldaten leg which spits jet flames that ignite your opponents.