Surgeon detachable magazine bottom metal is made from aircraft grade 7075 aluminum. Black hard anodized matte finishLow profile ambidextrous mag release. Beveled mag well for simplified mag changeWeight 6oz without magThe Surgeon bottom metal is a replacement for most Remington and all M-5 bottom metals. Gunsmithing required for installation. Included with bottom metal:(2) 1/4-28 cap screws and(2) Aluminum bedding pillars for perfect fit and function(1) Five round AI magazine (308) Surgeon Short Action Bottom Metal