Out of stock
SKU: FG2717
UPC: 014895003510
MPN: FG2717
The Otis Star Chamber Cleaning Tool for .308/7.62mm AR handles the one area most rifle owners skip: the star chamber and locking lug recesses where carbon packs in and eventually causes feeding and lockup problems. Built for AR-10, .308, and 7.62 NATO platforms, this tool scrapes fouling from behind the barrel extension where a standard bore brush can't reach. Cleaning that region by hand is awkward and time-consuming, which is exactly why it gets neglected. This tool centers itself in the chamber and does the work in a few twists, making it a practical addition to any gun cleaning kit built around a semi-auto rifle.
Otis pairs a parkerized steel scraper with a coated brass nose piece that centers the tool in the chamber and pulls fouling loose without scratching the metal. The felt cleaning pads slide over the scraper to collect the carbon the scraper breaks free, and the tool ships with 6 pads to start. The extendable handle gives you more control and reach into the chamber area, and the 8-32 threads on the tool accept a chamber brush for additional scrubbing. Replacement felt pads are sold separately, so the metal tool itself is reusable indefinitely. The whole assembly is compact and light enough to keep in a range bag or store inside a rifle case with the rest of your receiver cleaning gear.
Run this tool during your normal cleaning routine after range sessions or any time cycling starts to feel gritty. Carbon in the star chamber and lug recesses is a common cause of sluggish extraction and failure-to-lock issues on gas guns, and clearing it restores reliable function. Owners running both 5.56 and 7.62 platforms should note Otis offers a matching version for the smaller caliber. Pick up replacement pads and a compatible chamber brush at the same time, and pair it with the rest of your cleaning and gun care supplies. Match it with an armorer's bench mat for a clean work surface.
It clears carbon buildup from the star chamber and locking lug recesses of an AR-style rifle, an area a standard bore brush cannot reach. The parkerized steel scraper breaks the fouling loose and the felt pads pick it up, restoring smoother cycling and more reliable lockup.
This tool is made for 7.62mm, .308, and 7.62 NATO AR-10 platform rifles. Otis also offers a separate version sized for 5.56mm and .223 AR-15 rifles, so match the tool to your chamber caliber.
Yes. The metal tool is reusable and the felt pads are consumable. It ships with 6 pads, and replacement pads are sold separately so you can keep the tool in service indefinitely.
The tool has 8-32 threads that accept a compatible chamber brush, letting you follow up the scraper and felt pads with additional scrubbing for a more thorough clean of the chamber area.
No. The coated brass nose piece centers the tool in the chamber and keeps the scraper aligned, so it works the fouling loose without marring or scratching the metal surfaces.
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