Well, as a rule I don't comment on LDD creations, but I found this a worthy exception, and very promising too (taking into account the design of your M4). First of all, the thing looks far too boxy, and some brown pieces at the far end of it (opposite to the cannon, that is, the butt of the weapon), would be great. If it looked more crafty like your M4, it would greatly improve. Never give up, and keep up the good work! Freedom!