Hatsan MPA external choke availability

[RBWells]

hi, I've been trying to search the forums for a reference to Hatsan external chokes.
I would like to remove the muzzle break and install an extra full choke on the external threads of a Hatsan MPA shotgun. I've read that the 12GA X-Full Choke Saiga 12 By SGM might fit, does anyone have any experience with these?

What is the external thread measurement?

Thank you for any advice about the chokes.

 

[weasel1]

M1.5x22 iirc. Search for Hatsan and my name and you'll find about all there is. I got someone to make an adapter piece for me that I welded to a piece of shotgun barrel that was tapped for chokes. As for something readily available, I haven't found it yet