Thread size for Suppresor ?

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It depends on your barrel thickness. In general you want the largest thread you can get. I have seen accuracy drop because someone has put a 1/2inch thread on a barrel that should really be M14. The threaded end “flares” out. The only way to fix it is cut the barrel before the flare.

This isn’t the same case for the factory threaded barrels like the Howa’s.

Yep this
I had this happen with a Rem700 SPS .243
Had it threaded to 1/2 as I bought a second hand suppressor in his thread. Accuracy went out the window as the muzzle had flared out only ever so slightly. Had the thread cut off and threaded 14x1 and a new Waitaki suppressor fitted and it's back to sub MOA.

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