Headspacing on CMP SG and RG carbines?

[ramit]

Originally Posted by Carbineitis

Both Clymer gauges I received from CMP have a section of the rim grounded down. My preference is to fully disassemble the bolt to measure headspace.

tnx, also just got an email from clymer confirming the ones at CMP have the clearence , and Brownell's doesn't.

do you still dissemble as not to encounter the pressure from the extractor?

[Carbineitis]

Originally Posted by ramit

tnx, also just got an email from clymer confirming the ones at CMP have the clearence , and Brownell's doesn't.

do you still dissemble as not to encounter the pressure from the extractor?

I want to eliminate anything that can interfere with a true measurement against the bolt face. With the operating slide removed it's easy to move the bolt to an in-battery position. With the proper tools one should be able to disassemble, measure and reassemble a carbine in less than 10 minutes. Well worth the time.

** I have also measured headspace using the method of inserting the Clymer gauge to engage the extractor and moving the bolt forward by hand (no operating slide)...It would be a more expedient means of testing a larger quantity of carbines.