sentences:  This striker version of the P250 continues the modular format and shares several of the same components as its hammer-fired sibling including magazines and grip frames.As of January 25, 2017, the only available caliber for the P250 on both the SIG Sauer website and their online catalog is the P250-22 Nitron Compact .22 Long Rifle.Exchange kits can convert the P250 from .22 Long Rifle to 9mm, .357 SIG, .40 S&W and .45 ACP.