Shot in 1972, not released until 1977.
The gun being used at the initiation is a Derringer, this gun can only hold two bullets. It does not have a rotating cylinder, which is what is needed to play Russian Roulette, you pit one bullet into one of six chambers, spin the cylinder, so you don't know where the bullet is, each person cocks the hammer rotating the cylinder to the next chamber or spins the cylinder each time. The gun used in the film either would have to have been unloaded or it would definately shot one of the two initiates.