>>96779585
In theory yes, but putting a regular human soul into an otherwise regular sword or gun would likely have next to no utility. The the soul sitting in the sword would not have the power to manifest bullets or affect the blade strokes, it would just be serving as an inert soulstone with extra steps.
It is also worth understanding that, as the other anon was saying, the soul in a wraith construct is not the power source, it is the pilot. The construct is a robot with psychoactive wiring that allows the filled soulstone to control it in the same fashion a brain controls a body.
You could theoretically steal a soulstone or figure out a substitute, figure out how to shove a human soul into it, and then have it control machines with psychoactive circuitry, but that's very different from daemonic possession of inanimate objects, which works and is has a lot of utility because daemons are evil magical hell monsters that can just manifest their evilhellmagic through the thing their possessing.