Called and talked to SilencerCo directly before about this. The Trifecta/ASR Flash hiders are good to go for the scar only the brakes are a problem. Plus if you get a strike for some reason SiCo will take care of you
Yes you can use the brake without issues. Just use the included shims. If you don't feel comfortable with it then use the flash hider. Here are several threads where they have been installed.
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