You will need a wrench to install the AR 15 flash hider.
The size of the wrench you need will depend on the flash hider that you purchase. Be sure to check the size before you buy it to make sure that you have the correct wrench.
If you are not sure which wrench to use, consult a gunsmith or your local hardware store. They should be able to help you find the right wrench for your flash hider installation.
Robert Answered question July 5, 2022