This is a Hogue known as the HandAll Beavertail, model 17603.
Precision fit for SIG SAUER P320 Full Size models. THIS GRIP WILL ALSO FIT AND FUNCTION WELL ON THE FOLLOWING FIREARMS" THOUGH NOT SPECIFICALLY DESIGNED FOR A PRECISION FIT: (LARGER FRAME MODELS WILL REQUIRE STRENUOUS EFFORT TO INSTALL GRIP) SIG SAUER P320 X-Five" FN 509; Smith and Wesson M&P M2.0; Taurus TX22
Features:
Color: Flat Dark Earth
Gentle palm swells fit comfortably in hand
Finger grooves naturally position fingers for optimal grip
Textured with Hogue's famous Cobblestone pattern for increased comfort and grip
Beavertail cushions the hand on recoil and offers increased hand comfort higher on the grip
Made from long lasting durable thermoplastic elastomer that ages gracefully for years of service
Designed for a tight and secure fit engaging with the texture and contours of the firearm's frame