CVA AC1463B Cleaning Brush 54 Cal
https://www.tandktactical.com/shop/043125134632-cva-ac1463b-cleaning-brush-54-cal-5264
https://www.tandktactical.com/web/image/product.template/5264/image_1920?unique=6bd6cd8
CVA's blackpowder cleaning brushes are solid brass with 10-32 threads and are used to make cleaning quicker and easier.
