Jam Nut for Muzzle Devices
5/8 - 24 (.308)
1/2 - 28 (.223/5.56)
Designed to be Used to Secure Muzzle Devices in Place Reusable and Easier to Install / Uninstall Muzzle Devices Fits Standard AR Armorer's Wrench (Not Included)
CHECK OUT THE ALL-NEW CELIK CHIMER