Manson doesn't list 6mm ARC headspace gauges in their product catalog but it hasn't been updated since March so you might shoot 'em an email: david@mansonreamers.com Or call 'em at 810-953-0732. I might do this myself.
PTG does have headspace gauges for 6mm ARC. They're the only ones I've been able to find. Neither Clymer or Forster list them as well.
I had a PTG 6.5 Grendel GO gauge that my BCG wouldn't close on. I got a Manson, no problem! I measured both gauges at the datum line, the PTG was .0005" longer. Is that enough to stop the bolt from closing? I guess so...
PTG does have headspace gauges for 6mm ARC. They're the only ones I've been able to find. Neither Clymer or Forster list them as well.
I had a PTG 6.5 Grendel GO gauge that my BCG wouldn't close on. I got a Manson, no problem! I measured both gauges at the datum line, the PTG was .0005" longer. Is that enough to stop the bolt from closing? I guess so...
The trick is growing up without growing old. -- Casey Stengal