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Rock River Arms 458 Socom uses a muzzle thread of 5/8 x 32tpi
Alexander Arms 50 Beowolf uses a Muzzle Thread of 49/64-20tpi
50 BMG is I believe 1"-24 tpi at McMillan, 7/8 x 14 at Barret, and M24 x 1 for AI.
I also recall a 3/4 x 24tpi on a Desert Tac 338, and I believe M18 x 1.5 on an AI.
Not sure if you were wanting to go with one of the above for availability of muzzle accessories, or if you were going to come up with your own specs.......I once remodeled a house that had spuds in the walls on 13" centers......
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