Sig Sauer P320 was first introduced in 2014. It is based on the P250 model. The P250 was first modular platform. However, P250 had a DAO trigger and a spurless hammer, making hard to compete with other similar polymer framed pistols. It was offered in 6 different calibers, ranging from .22 LR to .45 ACP. P320 addressed the DAO trigger of it's older brother with a pretensioned Double Action Striker. It has brought the P320 a much wider popularity. Much was written and said about this particular...