Jacoby butt extention.

[richy1471]

Hi. I'm looking good at what pin size is used in jacoby butt's extentions.
Not the adapter but the actual pin on the mini butt extension

 

[chuckpilegis]

I put a cuefits pin in mine. A 5/16x14 qr if that helps

 

[chuckpilegis]

There are two kinds later one with quick release and a early one with a small thread pin