The following weapons were used in the film The Wraith:
Sawn-off Double Barreled Shotgun
A Sawn-off Double Barreled Shotgun is used by Skank (David Sherrill).
This is the actual screen used Spanish Zabala Shotgun held and used by The Skull (Geno Silva) in Scarface - 12 gauge.
Ithaca 37s are used by the police
Ithaca Model 37 riot version - 12 Gauge
A Franchi SPAS-12 is used by The Wraith (Charlie Sheen). Oddly, it seems to have both a wooden fixed stock and a top-folding stock.
Franchi SPAS-12 with stock folded and butt-hook removed - 12 Gauge