Buster and Chuck Niles (his only porno work?)
A Private Shooting (1980) – AKA Muscle Hustle found in The Big Surprise – which apparently went thru various edits/releases – this seems to be full version, with updated title intro (see link to YorjYefferson’s review below for more info) Not sure why Buster is the cameraman, but it works – and we can then have the double entendre for A Private Shooting.
YorjYefferson’s The Big Surprise review