APA GenII little Bastard Muzzle Brake

Can anyone give me a dimension of the nut on these brakes? I want to put one on my .308 but don't know if my barrel is too thin at 0.750"
 
Brake works great, makes SVT muzzle blast seem tame in comparison though1 blows stuff off benches on either side of me. like half full boxes of ammo. Minimum muzzle jump though. Small brake, works great.
 
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