Seekins PH3 Muzzle diameter

[sherbert409]

I recently purchased a Seekins PH3 in 7PRC with a 22” barrel. While waiting for it to arrive I’m proactively looking at getting a SRS Pro Brake. I am curious if I need the .860 diameter or 0.990. Anyone have any experience with this setup? Cant seem to find the recommended diameter online.


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