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I got a tap off of eBay so should be getting my machinist pal working fairly soon, as long as my fake can doesn't change noise it's still considered fake right?
The other posters are almost certainly right: 1/2x28. Cheap way to check: head down to your gun shop and pick up a cheap AR flash surpressor and thread it on. That will confirm it.
If your going to use a tap, just make sure you stay 90 degrees to the crown. You don't want your fake can pointing off in a direction that doesn't match your gun ..