This is a Hogue Pistol Grip known as the HandAll Beavertail, model 18300.
Hogue's Handall Beavertail Shield 45 Grip Sleeve has been engineered with models to precisely fit Smith & Wesson M&P Shield 45. While each sleeve has been created for a precise fit on polymer framed firearms" they also alternatively fit many other similarly sized firearms with a fully functional and aesthetic fit. This grip sleeve has ambidextrous palm swells" finger grooves and is made from a soft" durable rubber with a cobblestone texture.Note: This grip will also fit and function of the following firearms although not specifically designed for: Bersa Thunder 380" Ruger SR22" Walther PK380" PPK/S 380
Features:
Fits: S&W M&P Shield 45 Kahr P9/P40/CW9/CW40;Slips on Polymer firearms;Finger grooves;Cobblestone texture