The newest installment in the series, the P320 AXG PRO, goes a bit longer than the first two models, running a 4.7-inch barrel inside a Nitron-coated stainless steel slide with pro-cuts, giving it an 8.2-inch overall length. Weight is 34.5 ounces. Standard features include Hogue G10 grips, a flat-faced XSeries trigger designed to break cleanly at 90-degrees, and XRay3 day/night sights.
Oh yeah, and it is optics ready.
More details on the new Sig Sauer P320 AXG PRO, below.