update to the P226 line. 'E2' (pronounced 'E-squared'), or otherwise known as "Enhanced Ergonomics", is SIG Sauer's attempt to make the large frame gun more ergonomic for persons with small and medium-sized hands. A reduced grip size and reduced reach trigger bring the trigger face back more than , thus potentially allowing better trigger manipulation and control for a greater number of shooters. Other standard features include the Short Reset Trigger, aggressive grip finish texture, and a new wrap-around, one-piece grip panel configuration. The gun was discontinued from the P226 model lineup at the end of 2010 but the E2-style grip system has been adopted on and carried over to other P226 variants. P228 (M11) A compact version of the P226, the P228 is in use with various law enforcement agencies and also with the United States Armed Forces, where it is designated as the M11. The P228 has a shorter slide and barrel than the P226. Unlike the P226, the P228 is available only in 9×19mm Parabellum with a 13-round magazine, but can also use P226 15- or 20-round magazines. Aftermarket magazines extend the capacity of the P228 to 15 rounds. From a distance, the P228 can be differentiated from the P226 by comparing the trigger guards (the P228's is curved, while the P226's is slightly hooked) and the barrel and slide lengths (the P228's barrel , thus having a corresponding shorter slide). Also in a side-by-side comparison the P228 would appear slightly shorter ( shorter) than the P226. The larger capacity P226 magazine can also be employed in the P228 although it extends from the base of the grip. Civilian sales of the P228 were discontinued with the introduction of 9mm chambering in the P229 but were recently reintroduced in limited quantities to civilians with an accessory rail and hooked trigger guard, designated the P228R. The P229 is nearly identical to the P228, however its slide is made from milled stainless steel (versus the P228's folded carbon steel slide) and is available in 9mm, .40 S&W, and .357 SIG. In the summer of 2012, SIG Sauer announced they were releasing the M11A1, which is essentially the milled-slide P229 chambered in 9mm with P228-labeled grips, a short reset trigger, SIGLITE tritium night sights, Mec-Gar 15-round magazines, and a military style smart tag and serial number. Later in 2012, U.S. Air Force M11b versions of the P228 were released for