Auto-Trigger Pivot Pin Thread size?

[Pun1sh3R]

I am working on a project and want to add a Auto Trigger. I bought the slide frame auto trigger kit from Autococker parts.

I can not find any information on what the thread size is on the pin. I intend to drill and tap my pump arm.

I only found one site that says inception uses 5-40. But the threads do not match. 5-40 seems too fine.

Any Help would be appreciated.