Springfield Armory XDM0001C Backstrap #1 Textured Black Polymer for Springfield XD-M Compact
http://www.tandktactical.com/shop/706397888299-springfield-armory-xdm0001c-backstrap-1-textured-black-polymer-for-springfield-xd-m-compact-13534
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This #1 backstrap is used with the magazine backstrap sleeves for Springfield XD-M Compact .45 with 3.8" barrel.