Otis 5.56 BONE Tool

AR Bolt Carbon Scraper

Carbon builds up hard on the bolt and inside the bolt carrier of any AR-15 style rifle, and a brush and solvent rarely shift all of it. The Otis 5.56 BONE Tool is a pocket-sized scraper for .223/5.56mm bolts and bolt carriers, with shaped ends that fit the parts they clean. It suits rifle owners doing routine maintenance at the bench, and it is small enough to ride along in a range bag or cleaning kit.

Features

• Sized For .223/5.56mm — Made to clean the bolts and bolt carriers of 5.56mm AR-pattern rifles.
• Bolt Tail Scraper End — The knurled end has a shaped opening that slips over the bolt tail, the narrow rear section of the bolt, so a twist scrapes carbon off it.
• Carrier Scraper End — The flat, slotted opposite end reaches inside the bolt carrier to lift carbon from the interior where the bolt rides.
• Firing Pin Cleaning Hole — A cross hole through the body takes the firing pin, letting you work fouling off it by hand.
• Knurled Grip — Knurling, a raised diamond texture cut into the metal, gives a secure hold when your fingers are oily.
• NSN Marked — The body is engraved with NSN 1005-01-647-0562, a National Stock Number that identifies the item in the US military supply system.
• Compact Hand Tool — It fits in the palm and stores easily in a cleaning kit or range bag.
• Made In USA — Otis Technology produces the BONE Tool in the United States.

Build And Fit

The tool is a single black-finished metal body with no moving parts, engraved with the Otis logo, "5.56 BONE TOOL" and its NSN. Each end is shaped for a specific part of the bolt group, so you scrape carbon mechanically instead of relying on solvent alone. It is intended for .223/5.56mm AR-style bolts and carriers, and it pairs well with a standard cleaning kit for the rest of the rifle.