Easily change the grip size of your P250/P320 to achieve the desired fit for your specific hand size. The modular design of the P250/P320 makes this gun capable of a comfortable fit for any shooter.The P250 is available in four calibers, 9mm, .40S&W, .357SIG and .45ACP. The 9mm, .40S&W and .357SIG use the same module size. The .45ACP module is exclusive to that caliber. They are then broken up into sub-compact, compact and full size.Each of those modules are available in three different grip sizes, small, medium and large. As you can see, the Sig Sauer P250/P320 are the most versatile handguns on the market today.