muzzle tread on AR15 clone ?

Pre-1898

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I have a Polytechnologies CQA Ar15 clone in 5.56 cal and I would need to know if the barrel muzzle tread is 1/2-28 , 1/2-36 or else . I believe it is 1/2-28 but I need to confirm this.

Can anyone help me ?
 
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