What do you all have lying around? 
Needs to be 6mm minimum but I don't have an issue with anything up to 30cal. I installed a 5/8-24 adapter semi permanently onto a rifle and wouldn't mind spinning on a self timing brake for certain situations.
Also I've got a MBM baby beast 3 port non-self timing 9/16-24 (bored for 6mm) that was installed on a tikka that I don't foresee needing anymore if that is of interest to anyone.
Needs to be 6mm minimum but I don't have an issue with anything up to 30cal. I installed a 5/8-24 adapter semi permanently onto a rifle and wouldn't mind spinning on a self timing brake for certain situations.Also I've got a MBM baby beast 3 port non-self timing 9/16-24 (bored for 6mm) that was installed on a tikka that I don't foresee needing anymore if that is of interest to anyone.
