Well, I can tell from those photos you're not in CA. Lucky you.
HK21 GPMG.
Early 80s (1983) FJ Vollmer HK91 conversion.
It's totally TITS!
Is This Where TFL Crew Ended Up?
It's taking up too much baud and so we're coming over with a warrant. After all, it's for your safety. First dibs on the HK-21.