Headspace gauges

[ahamay79]

I need some expert advice. My "new" 1932 Izhevsk hex has failed the "no-go" gauge test, but passed the "field" gauge test. Should I have any concerns?

[mogunner]

I'd try a different bolt head to try and get it back to where it fails the No-go as well. The Field gauge was intended to measure the maximum clearance for the rifle to be useable in a wartime environment. Just my

[tjtM38]

Go to the Okie Headspace gauge site at the top of the page for some good information. He says a firearm that passes the Field gauge test should be safe to fire with milspec ammo.

[ahamay79]

Thank!! I'll probably bring it to a gunsmith just in case.

[ahamay79]

Oh yeah, I have another 91/30 coming in a week or so, so I'll probably swap bolt heads and check them both then.

[Junk Yard Dog]

Liberty tree collectors has bolt heads, the bolt head swaps in 10 seconds or less, this fixed all the headspace issues I have ever had on a Mosin. Bolt heads are not expensive and one will probably do the job.

[ahamay79]

They are sold out. I just checked Allegheny Arsenal and Buymilsurp.com and they have them.

[Junk Yard Dog]

You can find them on gunbroker as well.

[ahamay79]

I received my "new" bolt head today. I installed it and it passed the "No-Go" and the "Field Test". Let's go shoot stuff !!!!!

[bunkysdad]

Well that was quick and easy enough. Happy shooting. Amazing that the difference between a no-go and field guage is a measurement of. 004" if I'm not mistaken.

[Junk Yard Dog]

[zeebill]

Field test is what an armorer would have used for a gun in the field to be safe to fire, hence the name. I use a go or no go set of guages only just to be real sure. I have a field guage but it resides in the table drawer and never comes out of there. Just a personal choice on that and I too change only the bolt heads for adjustment. Too easy to do rather than mess with other ways. Bill

[websterz]

Well that was quick and easy enough. Happy shooting. Amazing that the difference between a no-go and field guage is a measurement of. 004" if I'm not mistaken.

.003" actually, or about the same as the thickness of a sheet of copy paper.

[desdem12]

Is that with or without the carbon paper?

[SA1911a1]

Is that with or without the carbon paper?

What is this "Carbon" paper that you speak of?

[qz2026]

Can't remember if you said you had others or others were coming. Just for S&G's, try the old bolt head on the other bolts and test them with the NG gauge and see what happens.

[websterz]

Carbon WHAT?

[ahamay79]

I do have another 91/30 coming next week. I'm going to check it as is, and then swap my old bolt head with it's bolt head and see if it passes, also.

[Ironnewt]

They are a great thing to have, help support an advertiser (and the Board) and give you some peace of mind.

[Junk Yard Dog]

I do have another 91/30 coming next week. I'm going to check it as is, and then swap my old bolt head with it's bolt head and see if it passes, also.

Probably will pass.