Headspacing? > Build It Yourself

Posted: 2/17/2007 12:01:59 PM EDT

Why do you have to remove the firing pin and the extractor to check headspace?

Posted: 2/17/2007 1:54:01 PM EDT

[#1]

It really depends on your guages. Some of them have an extractor groove cut in the base just like a live round and a hole drilled in the bottom where the primer would be on a live round. If this is the case you dont have to remove the extractor and pin. If the guage has a solid base then either the extractor or firing pin will keep the base of the guage from making contact with the bolt face and result in a false reading.

Posted: 2/26/2007 12:30:38 AM EDT

[#2]

Quoted:
It really depends on your guages. Some of them have an extractor groove cut in the base just like a live round and a hole drilled in the bottom where the primer would be on a live round. If this is the case you dont have to remove the extractor and pin. If the guage has a solid base then either the extractor or firing pin will keep the base of the guage from making contact with the bolt face and result in a false reading.

Does anyone know of a source that makes gauges that would not require me to strip the bolt?

Posted: 2/26/2007 4:38:15 AM EDT

[#3]

513-100-491
NO GO GAUGE, fits 7.62 x 39mm $28.00

513-100-490
GO GAUGE, fits 7.62 x 39mm

www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=7743&title=HEADSPACE+GAUGES

I just got these. They work great.

Posted: 3/4/2007 1:08:07 PM EDT

[#4]

height=8

Quoted:
513-100-491
NO GO GAUGE, fits 7.62 x 39mm $28.00

513-100-490
GO GAUGE, fits 7.62 x 39mm

www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=7743&title=HEADSPACE+GAUGES

I just got these. They work great.

i just ordered those two gauges as well... i hope they get here soon b4 i get an itch to goto the range and pull the trigger via string to see if its headspaced correctly

Posted: 3/4/2007 1:43:06 PM EDT

[#5]

Some time ago, I stumbled into a discussion (somewhere, sorry don't remember where) about the difference between SAMMI spec and Europeon military spec headspace guages for these rifles, and DO recall that the military guages were HIGHLY recomended for the AK.

Something about that the tolerances as reccomended by SAMMI for sporting cartridges were far tighter that for military? It's been a while, and just don't recall the details, but thought this might be a good time and place to mention it, and see what turns up, as there are bound to be some feller's around here that could enlighten us on realities.

In other words, is this bullshit or what?

PCM

Posted: 3/4/2007 5:04:58 PM EDT

[#6]

pyroclayman your post is dead-on and right on the money correct. about the headspace gauges VS sammi VS military ones its dead spot on the money.
I do no know whatever happened to C.Edward Harris who used to post regularly into fido-net guns bbs thing or whatever happened to it or if it even still exists, who knows for surewhat happened to that fragment of history, I dont know.
But Ed was pretty clear about the dimensional differences between military and SAMMI
headspace guages and reamers for both 223 rem and 308 rem and the military counterparts to them, they are widely different to allow military machineguns to run
like a raped ape while full of dirt and mud.
Harris once posted the dimensional specs differences between an USGI military
no-go gauge and a us military field guage and it shocked me at first, because no sane civilian would even think twice about shooting a rifle that far out of headpace.
but once I thought twice about it it finally made sense to me.
First off the bat. I have never had the displeasure of any experience on the two way
rifle range, or any other 2 way shooting ranges. so I cannot claim any experience there.
I have been shot with an 410 in an incident that was not a huntingaccident but was not repoted to the cops, athough I now realize I should have then.
I hope thid helps you out more.

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