Something isn't right. To only have .100 around the bore is kinda thin.
Looks to be a typo.
Here is the AAC's webpage. No option for 1/2"-28 thread for 7.62.
BLACKOUT® 51T Flash Hider
Looks to be a typo.
Here is the AAC's webpage. No option for 1/2"-28 thread for 7.62.
BLACKOUT® 51T Flash Hider