You picked D, ALL TOGETHER: a bandolier on every fighter, a linked belt on belt-fed guns and a drum where one fits. The reload drill pulls from them. Below is the finished look per gun, looping fire the gun dry → reload → fire, in the game's stickman style on a real full-night arena, at phone size and up close. Cosmetic only: no gameplay change.
Left: the close-up, with the reload's beats lighting up as they play and the timer filling. Right: the same fighter at the size a phone shows it, on a real DARK VIVID frame. Reloads run at the WEIGHTED lengths you picked.
Mags and drums show the spare ammo as a gauge: 4 pouches (2 for drums) light up for what is left out of the gun's full spare. Shells, long rounds and rockets are counted one to one: one item on the strap per spare. An ammo pickup fills the strap back up.
The fighter is 0.74 m tall in the game (184 units in this rig, so 1 unit = 0.0040 m). Every piece below is given both ways, so it can be built 1:1.