In the current state of the mod, all guns have the same kind of reloading, from pistol, assault rifle to bazooka.
How about adding a 2nd reload type, like a full magazine load?
Or a configurable reload timer, allowing for quicker, or slower reloading?
Basically, the old reload type can be used on the Shotgun, Pistol, Grenade Launcher and Bazooka, since they don't have a magazine rendered.
The Full reload type is a bit different from how the old reload style work, basically, it still use the original "reloadAmount" value to decide how long does a weapon take to fully reload
Take the Assault Rifle for example:

The "maxAmmo" value here is the capacity of the magazine, and the "reloadAmount" here, in the original reloading type, should be fully replenished after 4 loads, around 2s
In the Full reload type however, the "reloadAmount" will act like a timer until the gun is at the "maxAmmo" value. For example: An Assault Rifle with 10 bullets left in the magazine, will be fully loaded after ~1.5s after pressing reload button.
Secondly, the reload timer, if can be configured, can be a really interesting feature, adding more unique and contrast attributes to the existing armory.

Feel free to question if you don't really get what I mean, will be pleased to explain!