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howard2
 Expert Boarder
Posts: 95 
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What is meant by the term 'setting headspace' and how do you do it? Does this procedure also apply to AKM's? Any help would be appreciated.
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Angel-xan
Expert Boarder
Posts: 113
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If you have to ask, you don't try to do it. Setting headspace on an AK would mean screwing the barrel in or out of the reciever. This would also mean messing with the gas piston group and sights. Its not a DIYS job. If you're concerned, a smith can check it for you while you wait if he has the gauges. The good news is its not a thing that goes wrong unless the gun is worn out or has been seriously abused. Unless you are seeing stretched cases, don't worry about it. Pragmatist Please don't hesitate to let me know if there is anything else with which I can be of absolutely no help at all.
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CincySpaceGeek
 Expert Boarder
Posts: 128
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Very roughly, headspace is the distance between the closed bolt face and the end of the barrel closest to the receiver. There are gauges that are precisely made that are put into the chamber and the bolt is closed (or allowed to close). Typically these come in sets. One gauge is 'GO' the other is 'NO GO.' The NO GO gauge is, like, only several thousandths of an inch longer than the GO one. If the bolt will close on that one, the headspace is too great. (The 'smith isn't particularly interested in how much greater it is, the important thing is that it is greater.) This is bad because when a cart is fired in that chamber, the gas pressure and heat can cause the cartridge case to stretch and possibly rupture, which can, at best, tie up the firearm (a no-no in combat and a PITA otherwise), and at worst, the escaping gasses can actually explode the riflestock, and/or cause some serious injury to the firer.
The adjustment involves moving the barrel relative to the bolt face. As Mr. pragmaist said, if you gotta ask, don't even think about trying to do
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DSOseeker
Expert Boarder
Posts: 91
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Small correction: Generally, on a bottle-neck rifle case such as the 7.62 x 39, the headspace is measured from a 'datum line', (usually the midpoint of the shoulder of the chamber), to the bolt face.
Sorry, no joy on J'Lo's number. She said to keep it confidential.
Pragmatist
'It aint what you don't know that'll hurt ya, it's what you 'know' that aint so.'
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