The SIG SAUER P320 TXG Full-Size Grip Module is an OEM X-Series upgrade that gives your full-size P320 the heft and handling of a metal-frame gun while preserving the platform’s modularity. Molded from SIG’s tungsten-infused TXG polymer and finished in Legion Gray, the large-circumference module adds internal mass to tame felt recoil and steady follow-up shots, and it accepts the P320 fire control unit and full-size slide assemblies in 9mm, .40 S& W or .357 SIG. Built to accept an optional internal weight and magwell and optimized for X-Series magazines, this TXG module is a factory-engineered, drop-in path to improved balance, ergonomics, and competitive-style control without replacing your existing FCU. Sig Sauer P365 Low Cap Grip Module Assy TXG 320 9/40/357 Full Size Large Gry X-Change Kit 8900274