Forget what every one else says, its your gun, do what you want. Is it "childish" or "mal-ninja" no, its custome. There noithing wrong with having some fun with your firearms, yes its not a toy, but that does not mean you have to leave it stock, and not have fun with it. You can even paint it florecent pink if if that puts the wind up your scurt. If others dont feel the same then thats fine, they can have there boring guns, or only worry about the insides(which I understand being a mechanic) and ignore the look, or whatever, everyone is different. You gun, your money, your decision.