Norne hunt picatinny rail

[Johnnywood]

Does anyone know what size rail nut I need to create a second fixing point? and where I could source one? Thanks in advance for any pointers

 

[foxinmad]

You can get a short rail that goes onto the sling stud for the Norne. I have one on my 22/250, so I can use the Norne hunt bipod on two rifles.