Accuracy International Pre-2014 AX338 Muzzle Thread?

[CDNAIGUY]

I've searched and searched and can't seem to find what the muzzle thread is on my pre 2014 AX338 27" barrel?

Would anyone who has/had one know what it is? I'd like to swap out my brake for something else.

Thanks!

 

[mongoosesnipe]

UK-spec barrels with muzzle threads are M18x1.5 (metric)

As of winter 2010/2011, AI-North America (AINA) is shipping rifles with barrels from a US manufacturer. These barrels are threaded 3/4-24 (US standard).

This confuses things somewhat.

You can tell the difference because 3/4-24 threads have a pitch of approx 0.042". M18x1.5 threads have a pitch of approx 0.059".