This is the O.S.T. It is an AR15 carbon scraping/survival multi-tool. It has a steel tool that scrapes carbon from the back of the AR15 bolt face, from within the bolt carrier, from around the locking lugs, from around the firing pin and much, much more. It houses a flint rod to use with the scraper tool to create sparks for a survival fire. It also houses a steel sharpening rod to keep your knifes sharp and ready to work. All of these features are held by the weapons grade polymer housing. The whole tool was made to be small; the size of two CR123 batteries, so the O.S.T. can be stored within the battery compartment of common AR15 furniture (Forward Grips, Pistol Grips and Butt Stocks). If your a hunter, shooter or just like to be prepared, the O.S.T. is perfect for you.