To answer your question:
There is no such thing as a fusion rifle. Even in this far future you can't contain a nuclear fusion device in a hand-held gun. It's space magic. And as it is space-magic borne from your powers, it vanishes upon your death, like a titan bubble (I'm going to ignore nightstalker tethers for the sake of this argument).
[spoiler]I'm just joking around[/spoiler]
English
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What this game calls a "fusion rifle" is actually a hand-held [i] mass driver. [/i] What you are hearing "charging up" when you first pull the trigger, is actually an electromagnetic accelerator...and the delay is the weapon accelerating the projectiles up to firing speed. Its why "charge time" and "impact" are inversely related. it is (theoretically) possible to miniaturize such a weapon. You'd just need a very powerful energy source. to power the electromagnets.
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Yeah lol it defo vanishes