Installing a flash hider on a "post ban" barrel ?

[Hdawg]

I have a Bushmaster Hbar 20" A2 upper in the "post ban" flash hider-less configuration. Does anyone make an A2 flash hider that I can just slip on with a set screw or maybe some epoxy? Or do I have to have the barrel threaded? If I have to have it threaded, can I do it by hand with a die, or will the barrel have to be removed and threaded on a lathe?

Thanks in advance

[kendog4570]

It's best to have it threaded, and it's best to thread it with a lathe. I can do the work for you. The barrel has to come off as well as the front sight base. If you send it to me I could have it turned around in 1 week or less. PM for details.