Experimental: Transferring D&D items into modern/Sci-Fi
Primarily changes how ranged weapons work.
Every weapon will now roll two dice instead of 1, like the Maul. Example: Heavy Crossbow 1d10 > 2d5(I know a d5 is weird but follow along.)
Ranged weapons all have their short and long range increased by 30ft.
Sling > Pistol, Longbow > Rifle, Crossbow > Bold/Lever Action Rifle.
You can add a scope to double long range and use a bonus action to aim to ignore long distance disadvantage. Alternatively you can add a laser sight to increase your normal range.
You can think of more modifications/addons as you go along.