Sig Sauer P320 X-Series Grip Module, Carry, 9mm/.40/.357, Large. Install your P320/P250 firing control unit into this Grip Module Assembly to convert your P320 or P250 carry chambered in 9mm, .357 SIG, .40 S&W to a Large size X-Series Carry pistol system. Requires the 9mm, .357 SIG and .40 AUTO slide and barrel. This X-Series grip features an extended beavertail and high undercut trigger guard to promote a higher grip along with improved recoil control. Available in black and Coyote Brown polymer. Brand: Sig Sauer Caliber: 9mm,.40 S&W,.357 SIG Finish/Color: Black,Coyote Brown Firearm Type: Pistol Material: Polymer Models Fit: Sig Sauer P250,Sig Sauer P320