The Bisley extra long shotgun wool mops is an alternative accessory to the wire brush, a wool mop can ensure a smooth barrel which helps reduce shot clipping.
 
Features
Suitable for different gauges of shotgun - male thread
Attach to a gun rod for a softer clean than a wire brush
Can be used to apply gun oil inside a gun barrel
Will reduce pellet/shot clipping and give a better shot
Size options:  12 and 20 Gauge