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Gunsmithing Muzzle Brake size ??

308Dude

Sergeant
Full Member
Minuteman
Jun 3, 2009
96
1
56
Northern CA
How do I decide which size brake to buy? They come in 5/8" and 7/8" with 24 & 28 tpi.

This is for a 308 having a 0.820" barrel diameter.