You could at-least size down things that would relate to the blockhead's playermodel, make the scope have more surface area than blockheads entire face, make it so that he could grip the handle in a way that allows him to use the trigger.
Having large bulky powerful weapons is cool, but having garbage proportions is not. I'm perfectly okay (kinda) with a blockhead holding a gun that's literally larger than his own body, but when it boils down to the scope being the size of my head and the trigger being larger than my hand, that's just pure laziness.
I dunno. Maybe you can push it as your special unique taste in guns. I just think it looks lazy and thrown together.