I mean the physical design of the gun, not the projectile or effect.
I always loved the Needler from the Halo series. It was a really unique design at the time and probably the most fun I’ve had with any weapon in a first person shooter. Also, the explosions and the ching it does when reloading are just perfect.
While I never got into Halo, I have allways liked the Needler’s design, it looks sort of biological…
I really like the Aperture Labs portal gun.
The pod gun from Fifth Element is one of the most interesting from both a design and an effects perspective IMO.
Noisy Cricket
Deckard’s gun in Blade Runner was always my favorite. Somewhat uncanny because it was clearly sci-fi, but retained that hard boiled detective aesthetic, like you misremembered a noir shootout.