Pro-Shot 20S Bore Brush 20 Gauge Shotgun #5/16-27 Thread Bronze Bristles Looped Tip Brass Core
http://www.tandktactical.com/shop/709779100385-pro-shot-20s-bore-brush-20-gauge-shotgun-5-16-27-thread-bronze-bristles-looped-tip-brass-core-1228
http://www.tandktactical.com/web/image/product.template/1228/image_1920?unique=7cef0d6
Pro-Shots bore brush is exceptional for bore cleaning and it will not harm the bore. This bore brush will fit all 20 gauge shotguns.
