1 question for those who know

[Marinevet1]

I have a new AI AT, with a factory AI brake.........I want to replace it, is it 18mm X1.5, or 5/8 X 24?............I could measure it, but haven't taken the brake off..........

Thank you.

 

[Supersubes]

It depends on the barrel, but probably m18x1.5

 

[Marinevet1]

Brand new gun, AI 24" barrel........

 

[Diablo]

Pretty sure that the factory brake for the AI AT are threaded M18x1.5