This new Sig Sauer P250 pistol fires the .40S&W round. This awesome Sig offers a complete versatility in your firearm. You get a full size P250 and all the components to rapidly convert your full size into a subcompact. The barrel length on the full size version is 4.7", on the subcompact version it is 3.6". Both versions have night sights. When your Sig is in the full size version, your magazine capacity is 14 + 1 rounds. In the sub-compact version your capacity is 10 + 1 rounds. This pistol comes with the usual hardcase and lock. This very cool pistol is a superb innovation from Sig Sauer!