Install your P320 FCU (firing control unit) into the Sig Sauer AXG (Alloy XSeries Grip) metal grip module to experience the unique blend of style and shootability of a classic metal frame pistol. Precision machined with deep undercuts and an extended beavertail for an ergonomic, comfortable fit, the AXG grip module is fitted with interchangeable Black G10 grip panels from Hogue and a Medium Black back strap. Requires the 9mm, .357 SIG or .40 S&W slide and barrel.