This Breakthrough Clean Technologies Nylon Chamber Brush for AR-10 (.308 Cal / 7.62mm) is built with a durable brass core and stiff nylon bristles designed to effectively remove heavy carbon buildup from firearm chambers. The firm bristles maintain their shape over time and will not flatten or fall out, while remaining safe on the bore by avoiding scratches or damage. Precision-machined for a proper fit, it is compatible with .308/7.62mm MSR chambers and features a #8-32 thread for use with Breakthrough stainless steel cleaning rods. Manufactured in the USA, this practical cleaning tool is ideal for inclusion in any firearm maintenance kit, range bag, or accessory collection, offering reliable performance for regular upkeep and precision shooting.