The Springfield Armory 17-round magazine for the Hellcat Pro shares the same magazine body as the proven 15-round magazine. Featuring stainless steel construction, numbered witness holes and a polymer follower these premium magazines are the heart of the Hellcat Pro's unwavering reliability. FeaturesNUMBERED WITNESS HOLES - The magazine features 17 numbered witness holes on its back, a practical design for efficient ammunition monitoring during use.+2 EXTENDED BASEPAD - An extended basepad adds two rounds of capacity and conforms to the contours of the Hellcat Pro's grip frame and features the same Adaptive Grip Texture as the pistol.STAINLESS STEEL BODY - Crafted from durable stainless steel, the 17-round magazine body offers corrosion resistance and is highly polished delivering effortless reloads.