Used 6.5 DN5 Muzzlebrake with 3/4x24 threads.
85$ shipped CONUS
Awesome brake that keeps the muzzle down as good or better than the current 500-700$ muzzle brakes! Ask me how I know!
Finally clearing out some stuff in the closet. open to offers. Paypal FF, check, or trade for triggertech Diamond pro curved R700 works for me, hey have to try right:)