Suppressors Threading a barrel for TBAC muzzle break ultra 9

[wapiti16b]

I want to have the TBAC Ultra9 & Muzzle break system installed on my FN SPR , my question is does the muzzle need to be re-crowned after threading and if so will this screw up the chrome lining of the stock FN barrel . I ask because if it might damage the lining I need to budget a new barrel into the equation .
Thanks !

 

[Zak Smith]

The crown typically does not have to be touched

 

[wapiti16b]

Thank You Zak !