Captain Spaulding (Sid Haig) pulls a Colt Lawman MK III revolver from under his counter to take out the two robbers. It is identifiable by not having a shrouded ejector rod, and by its sights. It is likely the same Lawman used by Sheriff Wydell (William Forsythe) in The Devil's Rejects.
The second robber, Richard Wick (David Reynolds), appears to carry a stainless Ruger Redhawk revolver with stainless steel finish and a 7.5-inch barrel. This was previously identified as a Ruger Security Six with a 6-inch barrel. However, it can be differentiated from a Security Six by its large chambers and non-knurled ejector rod. The ejector rod housing is also not as thick as it is on the Security Six. The revolver being a powerful .44 Magnum also explains why Richard threatened to "blast a hole the size of a Kansas City watermelon" through Captain Spaulding's face. Richard's Redhawk also appears to have black rubber grips.
Error creating thumbnail: File missingRuger Redhawk with stainless steel finish and 7.5" barrel - .44 MagnumError creating thumbnail: File missingRichard follows Stucky out of the restroom with his Ruger in hand.Error creating thumbnail: File missingRichard aims his Redhawk. Note how the ejector rod is smooth, which gives further evidence that this is a Redhawk. Also, the size of the chambers, suggesting this is a .44 Magnum.Error creating thumbnail: File missingStucky mocks Richard with a rhyme from when he was in school: "Little Dick Wick played with his prick, Don't his smell just make ya sick?". Look at how long that barrel is! This is further evidence that it is a 7.5-inch Redhawk.Error creating thumbnail: File missingWick manages to blindly fire off a shot before being killed.
During one of the random intermission scenes, a man known as Lewis Dover is wielding a Sawn-off Single barrel shotgun, it is more than likely an H&R or New England Model shotgun.