Howard the Duck
The following weapons were used in the film Howard the Duck:
Smith & Wesson Model 19
Cleveland police officers and Ohio state troopers carry 4-inch Smith & Wesson Model 19 revolvers as their standard weapon. A Cleveland cop brandishes his weapon when they declare 'Shoot to kill' on Howard the Duck. One officer's Model 19 revolver is taken and wielded by Beverly (Lea Thompson) after she and Howard have a brief scuffle with said officer, resulting in their escape from the Dynatechnics lab.
Smith & Wesson Model 36 (Nickel)
A diner patron draws a nickel Smith & Wesson Model 36 when the Dark Overlord of the Universe inhabiting the body of Dr. Jenning (Jeffrey Jones) begins destroying the diner but is blasted by the Dark Overlord-Jenning before he can use it. The revolver is seen only for a few frames and at a distance so it is hard to fully ID properly - It is seen with a light-color which means it is most-likely a nickel-plated variant. It could possibly a stainless Model 60, but it is uncertain.
Smith & Wesson 3000 Shotgun
A Smith & Wesson 3000 Shotgun is used by an Ohio state trooper when the Dark Overlord of the Universe inhabiting the body of Dr. Jenning (Jeffrey Jones) attacks another trooper immediately after he and Beverly (Lea Thompson) run into a smog inspection checkpoint.
12 Gauge Over/Under Shotguns are seen in the hands of duck hunters when Howard passes over them in the Glider.