This is a Hogue known as the HandAll Beavertail Grip Sleeve, model 18601.
Precision fit for standard frame GLOCK 26" 27 models. THIS GRIP WILL ALSO FIT AND FUNCTION WELL ON THE FOLLOWING FIREARMS" THOUGH NOT SPECIFICALLY DESIGNED FOR A PRECISION FIT: GLOCK 26: Gen 5 (frame does not have finger grooves)" GLOCK 30" 31" 32" 33" 36" Heckler and Koch USP Compact" SIG SAUER P224" P320 Nitron Subcompact" Smith and Wesson M&P 9C" Walther PPQ SC
Features:
Color: Olive Drab Green
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