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Gunsmithing Help me ID this muzzle brake

pd721el

Sergeant
Full Member
Minuteman
Sep 22, 2008
204
1
51
Sioux Falls SD
I got this brake with a barrel I purchased. The original owner was unsure who made it, and I'm just trying to nail that down. What do you think? It is 338 cal.

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Re: Help me ID this muzzle brake

The OD to the round portion is 1.188, to the flat is 1.02. The shank is od is .902 and as best as I could get the threads are .57 to the inside and .64 to the outside. There are no markings at all.