Decal Grip  for Gen 3 Glock 31 – The Joker design by Invision Artworks. Features a textured, rubber-like grip surface to give you a better grip and more control of your firearm. Cover just the frame or add grip and design to the slide of your G31 as well. 
Easy, do-it-yourself installation, watch the video:

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 USE Coupon Code: Showgun