The following weapons were used in the film Phantasm:
Remington Model 870 Shotgun
Colt MK IV Series 70
Jody and Mike also use what might be a Colt MK IV Series 70, Jody says it's Colt Army Issued.
Star Model B
What appears to be a Star Model B is used as a stand in for the 1911.
Jody has two rifles on a gun rack, one looks to be a Gewehr 1871/84.