The TXG Grip Module uses tungsten-infused polymer that is then molded into the part. This patent-pending process results in a grip module that has the weight of steel and the flex of polymer. Install your P320 Fire Control Unit into the TXG, and you ll have one of the flattest, softest shooting pistols on the range. Requires complete P320 Fire Control Unit and X5 or Full-size slide assembly. Product Features This grip module does not includes the extended magwell and internal weight. The X-Series Grip Modules will only fit new style magazines with the circular SIG SAUER logo and square locking tab on the bottom of the basepad. Mags marked SIG SAUER with circular locking tabs require modification to properly fit.