Just out of curiousity, how may rounds have you fired out of this rifle?
I've been considering the purchase of one of these LRH's and this is just one of several problems that I've heard of since researching them.
If the solvent-soaking hasn't loosened it up I'm wondering if the bore of the muzzle brake might be off-center just enough to shave some of the jacket of one or more of the bullets that have blown through it. If it is small particles of bullet jacket that's causing the muzzle brake to seize up, that might be why the the solvent hasn't worked yet.
If you take a magnifying glass and look closely at the inside of the muzzle brake, can you see any evidence of this happening?
I'm sorry I'm not much help with this problem. In an odd sort of way, you've been more of a help to me. I think I'll pass on the LRH for now and go with my other choice.
HollowPoint
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