From their website. "The patented XGRIP mag adapters adapt full size and compact magazines for use in compact and subcompact pistols. XGRIPS provide greater versatility incorporating larger magazine into a compact or subcompact pistol’s grip, increasing the capacity with additional ammunition. Law enforcement and military personnel can carry the compact or subcompact pistol with a standard magazine when concealment is important, then insert a higher capacity magazine with XGRIP when firepower and capacity become critical."
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