I built an upper with a kotonics/cardinal 6.8mm SPC barrel that had the "improved" chamber. I used a Stag lefty upper and a stag lefty 6.8mm BCG. All 3 components were bought from separate places.
So... How are you supposed to *use* HS gauges? Do I need to take the barrel out of the upper? Do I need to use the HS gauges with just the barrel & bolt, but no bolt carrier? Do I need to take the firing pin, extractor and ejector out of the bolt? Why do my HS gauges have this big slot cut into the bolt-facing end of the gauge? Do I need to try to align that slot with anything?
And why couldnt i find any 6.8mm field HS gauges?
My 2 manson 6.8mm headspace gauges didnt come with any instructions. Now on the manson site they had a blurb about some extra things you had to be careful of when measuring headspace on improved chambers. Im not sure if that situation applies to the 6.8mm improved system.
http://www.mansonreamers.com/Instruc...y%20Gaging.pdf


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