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Old January 10, 2019, 09:30 PM   #2
Mobuck
Junior member
 
Join Date: February 2, 2010
Posts: 6,847
I have an older "post-ban" AR that has this combination.
My guess is there's a cut just behind the muzzle that the set screws tighten into. After removing the set screws, a few light taps with a non-marring hammer should pop the brake off.
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