Anyway my idea was even for players characters, no need to adding non lootable gun. You already have double heavy minigun for turrets on .223 ammo I guess.
You reject this double barrel resonably constructed minigun for NPC and player use in favour of a minigun turret?
If so, then you have to tweak the double minigun turret model so you can caary and use it in combat.
Why this obsession with loot. Pfft alright..whatever...give this double barrel minigun a hefty weight statistic. Ya, 2x the wieght of the avenger in addition to the 2x the ammo weight. Further additional wieght is the extra metal used to make the gun, say 0.5x. Sure loot it if you can carry it.
People running 1 strength builds...good luck! Grab the fucking thing and run, only to be ganked by a pedestrian.