This is Cpl. Hicks' Ithaca Model 37 shotgun from "Aliens". I recently picked up the Aliens: Colonial Marines video game, and it revitalized my love for the movie. So I looked up some pics and replicated this as close as I could get it. There weren't alot of details on the weapon, but I did what I could. It measures 22.5" long which I found out is the exact length. While researching, I also found that it uses a single port for both loading and ejection of shells.