Hoppes 24011VD Viper Den Bore Cleaner M-16, .22-.223 Caliber, 5.56Mm, Rifle. Hoppe's BoreSnake Viper takes the world's fastest gun bore cleaner and makes it even better. The BoreSnake Viper utilizes the same one-pass pull-through technology and compact storage size of the original BoreSnake with the addition of an extra cleaning brush for a total of three, providing 50% more cleaning power. The new patented case for storage between range trips with a lid that doubles as a pull handle means you will always be ready for a clean weapon in no time.