Quote Originally Posted by Edward Horton View Post
Both style gauges can be used with the bolt fully assembled.

If your readings are close to failing or does fail you will get a more accurate reading with the bolt dissembled without the weight of the firing pin spring forcing the bolt closed.

Again you do NOT have to dissemble the bolt to check head space with either type gauge BUT.......

Good looking, exceedingly smart people with brilliant minds take the bolt apart and ugly unemployed shade tree mechanics check headspace with the bolt assembled.

I Resemble that last remark! ...just remembering back to some who pull their bolts apart.... I'd say they were just unqualified hack gorillas who never managed to develop a craftsman's "feel", but liked to show off the use of the opposed thumb that they had recently realized could do more than just grip tree branches!

I'd suggest maybe the coin type gauges are hard to use with the extractor on.......
Get the cartridge style as in Mr Horton's pic. Much less hassle.... (with a bit of practice..)