Mini-14 Tactical barrel threads ?

[bossgvr4]

Just got a used 581 series Tactical and was wondering if anyone could tell me what the muzzle threads are ?

According to the Ruger production date chart this rifle was produced in 2009-2010.

Thanks in advance for any help/info.

[DDelambre]

Most common should be 1/2 x 28.

I think there are some odd balls out there though, which could be 1/2 x 36 or even
9/16 x something......

someone else could probably answer better than I...