Here is a good article on the P250 series thetruthaboutguns.com/2012/04/chris-dumm/gun-review-sig-sauer-p250-9mm-2sum/ and another gunsandammo.com/reviews/one-serious-sig-sig-p250-review/

Hi, The P250's innovative design enables the shooter to quickly remove the functional mechanism and place it into the polymer grip of his choice. This allows an immediate change in caliber and size; (subcompact, compact and full). And after any change the pistol delivers both outstanding accuracy and reliable functionality. Its modularity not only provides incredible ease of maintenance, but also provides a solution for accommodating different hand sizes - there are 6 different ergonomic combinations for each size, accomplished by changes in grip circumference and trigger style. Different size module examples here : selwayarmory.com/shop-by-category/firearms-parts/sig-sauer-parts-and-tools/sig-sauer-p250p320-grip-modules.html Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

Here is a good article on the P250 series thetruthaboutguns.com/2012/04/chris-dumm/gun-review-sig-sauer-p250-9mm-2sum/ and another gunsandammo.com/reviews/one-serious-sig-sig-p250-review/

The P250's innovative design enables the shooter to quickly remove the functional mechanism and place it into the polymer grip of his choice. This allows an immediate change in caliber and size; (subcompact, compact and full). And after any change the pistol delivers both outstanding accuracy and reliable functionality. Its modularity not only provides incredible ease of maintenance, but also provides a solution for accommodating different hand sizes - there are 6 different ergonomic combinations for each size, accomplished by changes in grip circumference and trigger style. Different size module examples here : selwayarmory.com/shop-by-category/firearms-parts/sig-sauer-parts-and-tools/sig-sauer-p250p320-grip-modules.html