Watched He Was a Quiet Man. I don't know what the budget was---they said they had no budget. But it starred Christian Slater and William Macy. Filmed on digital video.
Written and directed by Frank A. Cappello who wrote the script for a Hulk Hogan movie, Suburban Commando---and some other, apparently better movies.
Christian Slater plays a pitiful office work. He brings a gun to work trying to work up his courage to commit mass murder. But another guy beats him to it, starts shooting, and Slater becomes a hero by shooting him.
It was pretty good. Filmed in 21 days. It looks like it cost a lot more than it did, made without money but with actual stars and an experienced writer-director.