[@BCTheEntity] You know what the M2 Browning Machine Gun looks like? That's roughly what a heavy stubber looks like. Browning is actually the God-Emperor and his designs are the reason the Imperium is as big as it is. I'm not saying a spess mahreen couldn't tote one around, they would probably have no problem with it, the issue would be the fact that it has no provisions for different grips or anywhere to mount an ammo box. Short of extensive modifications a la the T33 conversion of the M1919, he'd have a hard time, not because it would be particularly heavy or unwieldy to him, but simply because it's not set up to be used that way...