Breakthrough Clean Phosphorus Bronze Bolt Carrier Brush for AR15 / M16 / M4

Phosphorus Bronze Bolt Carrier Brush Features Durable phosphor bronze bristles for effective cleaning without damaging your bore. Twisted brass core keeps brush rigid. Deeper cleaning action than Nylon brushes. Available in various calibers. Phosphorus Bronze Bolt Carrier Brush Specifications Durable phosphor bronze bristles for effective cleaning without damaging your bore Twisted brass core keeps brush rigid Deeper cleaning action than Nylon brushes Standard #8-32 thread