This version of our larger clamp on style brake is designed with the AR-10/15 platform shooter in mind. A much smaller design, it still maintains enough surface area to make it a very effective brake. It is easily removed for cleaning or installation of a suppressor. Ports are to the sides to reduce ground blast. Calibers .22 and up. Installs using a crush washer (included). 4140 Steel. Made by Badger Ordnance Part number 249-82