Barrel length is the big difference.

MODEL 92G ELITE IA (BRIGADIER)
- 9mm Para. cal., similar to Model 92FS Brigadier, except has 4.7 in. stainless barrel and many standard I.D.P.A. competition features including front and rear serrated slide, skeletonized hammer, and removable 3 dot sighting system, plastic grips, includes Elite engraving on slide, 35.3 oz. New 1999.

MODEL 92F & 92FS CENTURION
- similar to Model 92F, except has compact barrel slide unit with full size frame, 4.3 in. barrel, choice of plastic or wood grips, 3 dot sight system, same length as Model 92F Compact, 10 (C/B 1994) or 15* shot mag., 33.2 oz. Mfg

MODEL 92F & 92FS
- 9mm Para. cal., official U.S. military variation of 92 Series, 4.9 in. barrel, alloy frame, steel slide, 10 (C/B 1994) or 15* shot mag., chamber loaded indicator, matte black Bruniton or olive drab (new 2004) finish, squared off trigger guard to facilitate two-hand shooting, extended mag. base, choice of regular or 3 dot sights (new 1991), approx 34 1/2 oz. Model 92F-P has plastic grips. Model 92F-W has wood grips. New 1984.

MODEL 92FS BRIGADIER
- similar to the Model 92FS, except has heavier slide to reduce felt recoil, wraparound rubber grips, and 3 dot sights, 35.3 oz. New 1999.