The SIG SAUER P320 TXG Full-Size Grip Module is an OEM X-Series upgrade that transforms your P320 into a heavier, more stable platform without sacrificing modularity. Constructed from SIG’s tungsten-infused TXG polymer and finished in Legion Gray, the small-circumference module adds internal mass to reduce perceived recoil and steady follow-up shots while still accepting your existing P320 fire control unit and full-size slide assemblies. Built for 9mm, .40 S& W and .357 SIG configurations, the TXG module supports installation of an internal weight and an extended magwell (sold separately) and is optimized for the newer X-Series magazines, making it an ideal factory-engineered solution for shooters who want improved balance, recoil control, and competition-style ergonomics in a drop-in, FCU-compatible package. Sig Sauer P365 Low Cap Grip Module Assy TXG 320 9/40/357 Full Size Small Gry X-Change Kit 8900273