The Sig Sauer 2 Sum, ( 2Sum ), Package has a full size and a subcompact P250 frame. Making this the perfect carry and range package. This is the precursor to the P320 and is hammer fired compared to the P320 which is striker fired. Being modular it is easy to swap the trigger mechanism to either the subcompact or full size frame. The P250 is double action only and has a not only light but smooth trigger pull. Being double action only it has the same trigger pull every time. Both slides have Sig Sauer white three dot night sights.