Mean Guns (1997)

A gangster boss (Ice-T) has a list of about 100 people who have screwed up at one point or another. Rather than outright killing them, he decides to have a little fun by putting all of them together in a high security prison, unarmed, and dumping bucketfulls of guns, ammo, and baseball bats on them and letting them kill each other. The final three who survive are given a prize of 10 million dollars. Let chaos reign.