Description Bore Tech’s Extreme Grease HD is a premium grease formulated specifically for use on firearm locking lugs, frame rails, hinge pins and camming mechanisms where smooth operation, extended part life and performance under extreme conditions is required. It is an ultra-tacky triple based synthetic blend formulated specifically for superior firearm operation. The high performance extreme pressure additives, enhanced rust inhibitors, and nano-ceramic temperature lubricants provide a wide operational temperature range of -85°F to 700°F and eliminate the “gumming” and “running” found our competitors’ brands. The proprietary formulation has a much lower coefficient of friction than moly disulfide, fluoropolymers, lithium and graphite based greases and penetrates into metallic and polymer surfaces providing unsurpassed and extended lubrication to over 2000°F.