From The Manufacturer/Wikipedia/People Smarter Than Us:
The Government-size Predator is a pistol that is unique in its design. Its most distinctive feature is the heavy flanged cone match grade barrel that adds definite advantages to the 1911 design. The extra weight of the heavier-than-standard barrel gives the shooter softer recoil and faster recovery time between shots. The slide is relieved and the barrel is fit so precisely that you’ll have a hard time seeing light between the end of the slide and the barrel, yet it never touches.