Lelya air tube size

[Sean]

Hey everyone. I want to know if anyone has mounted a light or bipod on the lelya 2.0? Okay really I just want to know what size scope ring will fit on the air tube? I want to use a scope ring and mount a pic rail to it and put a light on the darn thing. I have no way to get a accurate measurement. I'd like to see what others may have done. Thanks for any reply.