What movie is this?

Somebody on Facebook is looking for this movie, and now I’m curious.
“I’m looking for a movie I saw 10+ years ago. It was a sequel or #4/5/6 of a series of movies. It was a dark comedy where demons invade earth and there’s a bunch of sexy women with guns. A few scenes I remember are: a karate master getting his arms ripped off in a sewer and can’t climb a ladder. A man tries to show a woman how to shoot a gun and then accidentally shoots himself. And the ending has some weird non sequitur of a guy playing guitar and a giant robot.”
Please help!

The “sexy women with guns” reminds me of Jim Wynorski’s Hard to Die (1990), which is the third movie in the Sorority House Massacre series. But nothing else you describe fits that movie.

Tokyo Gore Police?