"The SIG Sauer P250 takes a whole new approach to handgun ergonomics. Innovative engineering allows it to be configured in any one of three different frames sizes or four different chamberings all in one gun," so observed Field Editor Wiley Clapp in a feature (December 2008, p. 46) examining arguably the most innovative handgun in recent history.
Clapp observed that the P250's lock module is its heart and that it houses the hammer, the trigger and the springs that power both, as well as the slide rails and the solid steel guide block that cams the barrel in and out of battery during the firing cycle. When combined with one of several grip modules, the P250 adapts to smaller or larger hands with ease.
But what really captured our attention is how the P250 lock module could be configured to accept different chamberings and barrel and slide lengths. Barrel lengths of 3.1", 3.9" and 4.7", chamberings of 9 mm, .357 SIG, .40 S&W and .45 ACP and magazine capacities running to 20 rounds of 9 mm make the P250 a handgun system of unprecedented flexibility.
Clapp continued, "There's more to it than just a flurry of sizes, shapes and calibers. The P250 is a marvel of simplicity, with far fewer parts than anything comparable, yet its ability to transform itself in any number of customized configurations lends it greater appeal to shooters of varied interests.".....