Nope, I open UESP up just to look it over again, nope. They have spikes that create the illusion of being crossbow contraption, but both types of Spheres have them. And the other one propels its sword out of its hand if you engage it. So that means, these constructs have a mechanism capable of propelling stuff other than bow. That can be considered a gun.
IMO fantasy style guns would work. Some "conservative" people here often reject the idea of guns as if those, who advocate for guns, want AK-47's in the game. -.-
A fantasy gun could be just an alternative to staff built for those who don't have magical affinity. That is the same reason I hated Skyrim staves. Staves do not shoot fireballs like rifles. They only amplify caster's spells.