Joined: May 27 2012 Location: United States Posts: 3
Posted: May 27 2012 at 1:06pm | IP Logged
I have a question regarding head-space - I just got done pressing a virgin m70 barrel into a virgin trunnion, and head-space is looking pretty close to set. The disassembled bolt will close on a go gauge, and will not close on the no-go gauge, and fit is snug but not overly tight with a go gauge + one layer of scotch tape.
However, the bolt will rotate partially (as if it were going into lock-up) on the no-go gauge, probably about 1/3 of what would constitute "in battery". The bolt will still not completely close on the no-go gauge, even with a good deal of pressure being applied to the back of the bolt carrier.
My question is does this mean it passes head-space, or should it be pressed in just a tad bit more?
Thanks! - Soggywaffles
Joined: October 22 2011 Location: United States Posts: 1343
Posted: May 29 2012 at 10:09pm | IP Logged
I would say that it passes. If it won't fully close on the no go, you are set. You could press it in a bit further but.........i would probably just go with it.
Even closing on a no go gauge does NOT mean that it is unsafe to shoot. It just means that there is more head space. Most military rifles are looser then saami spec on purpose, to promote reliability in the dirty conditions.
Mil spec is more lax then saami spec.
The go gauge is the BEST possible setting. Or more, the tightest safe setting.
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