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A black anodized, aluminum bottom metal and trigger guard with a polished steel to allow for a tight grasp on the magazine. Instructions and all necessary parts will be provided. The bottom metal kit allows other Ruger American rifles to be converted to allow the use of the Ruger AI-Style magazines with compatible calibers when they are assembled to a Boyds stock. See compatible calibers at here: https://www.boydsgunstocks.com/ruger-american-ai-magazine-kit.