The term Bisley Brush refers to a range of firearm cleaning brushes designed for use with shotguns, rifles, and airguns. These brushes are used as part of routine maintenance to remove fouling such as carbon, lead, powder residue, and plastic wad deposits from internal firearm surfaces. Different versions exist depending on the application, including phosphor bronze brushes, nylon brushes, and chamber-specific brushes.

The most common type is the phosphor bronze brush, which is made from tightly wound bronze bristles around a central twisted core. This design provides strong scrubbing action while still being softer than steel barrels, reducing the risk of damage when used correctly. The bristles are arranged to provide full contact with the bore, allowing effective removal of stubborn fouling that patches alone cannot shift.

Each brush is sized for a specific calibre or gauge, ensuring a proper fit inside the barrel or chamber. This ensures consistent cleaning performance and prevents damage from incorrect sizing. Chamber brushes are often thicker and designed for more aggressive cleaning in areas where fouling tends to build up more heavily.

In use, a Bisley Brush is attached to a cleaning rod and typically used alongside a solvent. It is pushed and pulled through the barrel several times to loosen and remove fouling. After brushing, patches or wool mops are used to remove residue and apply oil for protection.

Overall, Bisley Brushes are essential maintenance tools used to keep firearms clean, maintain accuracy, and prevent long-term build-up inside barrels and chambers.