We require that a bolt be head-spaced to each 22 mm ARC barrel we send out. The industry standard for Type II Bolts is too varied, and in order to ensure that you have a fully functional barrel your bolt must be head-spaced correctly.
You can either send in your bolt to be head-spaced or you can purchase a MOS-Tek bolt. If you are sending in your bolt click on this link to take you to the shipping instructions. Ship the bolt in a box, not any type of envelope, they can easily be damaged (happened on more than one occasion)
If you have any questions give us a call! (480) 440-1878
Thanks!