Searching for a video of how to...

[carwashchris]

Check headspacing on a M1. Tried the search feature but nothing, thought there might be a sticky.

Chris

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[imarangemaster]

Not a video, but great article on using gauges on the CMP page from their armorers. It is for M1 Garand, but the Carbine is done identically.
http://www.odcmp.org/0309/default.asp?page=M1HEADSPACE

[carwashchris]

Thanks that helps. I guess the only adjustment then is to swamp bolts untill you get a GO !

Not a video, but great article on using gauges on the CMP page from their armorers. It is for M1 Garand, but the Carbine is done identically.
http://www.odcmp.org/0309/default.asp?page=M1HEADSPACE

[shadycon]

Do you have a problem or just curious ? Has someone changed the bolt or barrel? The gages arn't cheap and should come with instructions.GK

[carwashchris]

Some times I get a few light primer strikes that don't fire it's factory ammo so Im assuming the case length is correct. Just looking for other possibilities. Chris

Do you have a problem or just curious ? Has someone changed the bolt or barrel? The gages arn't cheap and should come with instructions.GK

[Badger]

Here's an interesting general head spacing video in the Gunsmithing forum which I'm not sure you'll find helpful or not...

Head Spacing (mini lesson) - AGI Gunsmiths

Regards,
Doug

[JimF4M1s (Deceased)]

Here's an interesting general head spacing video in the Gunsmithing forum which I'm not sure you'll find helpful or not...

Head Spacing (mini lesson) - AGI Gunsmiths

Regards,
Doug

Good video, thanks Doug.

I have the gauges, they are part of my tool collection. I have not had an issue with any of my carbines. Yet that is. I don't remember any issues in full auto over seas. But that has been over forty years ago.

That being said, I'm not saying there is no need to check headspace, we need to error on the side of caution. CMP carbines have been checked. If you change a barrel, you need to check. Those that reload should take more heed. Check your brass when you trim to length. Also a good point was the use of military verses commercial brass. Not as many reloads with the newer cases. Should add primers to that too. Some are harder then others. Firing pin protrusion, primer flattening, a lot of things to consider.

I think the best thing I saw in the video, don't test it yourself. I think I'll go get my brother in law, his name is Mikey, he'll try anything.

[carwashchris]

First thing first, I think I will check the protrusion of the FP and clean the bolt. I have been using AE & PPU ammo. Have not measured the case length, I'm just assuming they are correct. I'm only getting this problem 2 out of 10 times. I have been able to reload these same rounds and get them to fire on the 2nd or 3rd try.

[shadycon]

Have you looked at the fireing pin closely for wear? Do you have light and heavy strikes? What make of ammo? Do you have a way to measure the cases just to see if they are correct? GK

[DaveHH]

I bought a couple of spares a few years ago and one was eroded and worn beyond belief. You had to look at it under a strong glass to see it. The FP was one of the problem parts with carbines due mostly to poor heat treatment.

Headspace gauges are available from Midway for about $30-35 each. You need a go and field. They do not require a bolt disassembly to work. The most important and dangerous condition is not a carbine with excessive headspace, it is a gun with too little headspace. Remember to use only light hand pressure to measure. Do not let the bolt slam onto the gauge.