Colt has what I would describe as three product levels. The "lowest", that is, least expensive, is the 1991A1 line. They appear very much like all Colts did through the 1980s, with little in the way of bells and whistles, but with the Series 80 firing pin block. S80 is a passive "safety" that physically blocks movement of the firing pin until the trigger is pulled. The original M1911 lockwork design (which is now usually, and erroneously referred to as Series 70) relied only on a strong firing pin return spring to prevent a discharge in the event of a muzzle-down drop. The XSEs have more bells and whistles, in the form of Novak-style sights, duckbill grip safeties, additional forward cocking serrations (love 'em or hate 'em), while still incorporating Series 80. Beyond that, are a number of different "custom shop", "limited production", and other models that are in the catalog, but which can't really be lumped together according to features or price. They would include the Gold Cup, Combat Elite, Delta Elite, Special Combat Government Model, Series 70 reproduction, M1911 reproduction, etc. Colt really makes a model or models for just about any use.