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Thread: Quick AK47 Headspacing question

  1. #1
    Gunco Rookie darbish's Avatar
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    Default Quick AK47 Headspacing question

    I just had a quick question about headspacing, and I can't see anything quite like my question in the archive. I've got a virgin barrel (with no sight block or gas block or anything already attached) pressed into my front trunnion and the bolt closes on the go gauge, and won't close on no-go. However, when the bolt closes on the go gauge, it doesn't close super smoothly unless I tilt the carrier a little. But it does close. Is this something I should worry about?

    I don't want to spend the next hour trying to press the sucker in and out and risk screwing up the diameter of the chamber, but if this is a catastrophe waiting to happen I don't have a choice.

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    Gunco Member ammoboy2's Avatar
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    I would not worry about it, the main thing is to get the go to fit and the no go not. You are there. A virgin barrel will not install smooth so to fine tune it further will be tricky and potential for screwups is high.

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    Gunco Member Smorgas's Avatar
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    I'd think that you would want it to close a little tightly on a go gauge because the headspace will open up a little over time. My AR10 build closes pretty tightly on a go but won't even bugde on the no-go. It's a Fulton BCG and barrel. I spoke to them and they said that this was by design for the reason stated above.

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    Gunco Regular akblue's Avatar
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    Try it with a cartridge (safely) and with just the bolt., no carrier and see how it reacts. Just a few different avenues to doube check. Sounds like you are OK., but do it once and do it right is always a good idea.

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    No Hope For Me 1biggun's Avatar
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    First check it an set the barrel with out the carrier . If aftr you install the carrier the bolt does then not close you have a mechanical problem not a head space issue .

    Tilting carriers is not part of setting head space .

    If you have uneven lug engagemt then a carrier will give you a false head space check.

    head space is the longest distance from the bolt face to the back of the guage PERIOD . If that distance is made by tilting the bolt then you have a mechanical problem .

    I head space with no carrier look to see if the bolts shaft loos true tot he bore . i then install the carrier an recheck if it dosent close i fix the problem . I dont drill the pin hole untill It works correct with an with out the carrier ,


    It's a Fulton BCG and barrel. I spoke to them and they said that this was by design for the reason stated above. what the hell does that mean ??

    did fulton make the bolt control group ? bolt , carrier , barrel trunion ? do there barrels press hard by design ?? what design feature makes it hard to press a barrel or need to cock a bolt to get it to rotate in ????????????????

    I proper barrel should have about .001" interferance fit an should press in pretty smoth if the bore is lubricated an the edge of the barrrel pin bore is champhered properly .

    You need to set the head space properly If it takes all day so be it .

  6. #6
    No Hope For Me 1biggun's Avatar
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    First check it an set the barrel with out the carrier . If aftr you install the carrier the bolt does then not close you have a mechanical problem not a head space issue .

    Tilting carriers is not part of setting head space .

    If you have uneven lug engagemt then a carrier will give you a false head space check.

    head space is the longest distance from the bolt face to the back of the guage PERIOD . If that distance is made by tilting the bolt then you have a mechanical problem .

    I head space with no carrier look to see if the bolts shaft loos true tot he bore . i then install the carrier an recheck if it dosent close i fix the problem . I dont drill the pin hole untill It works correct with an with out the carrier ,


    It's a Fulton BCG and barrel. I spoke to them and they said that this was by design for the reason stated above. what the hell does that mean ??

    did fulton make the bolt control group ? bolt , carrier , barrel trunion ? do there barrels press hard by design ?? what design feature makes it hard to press a barrel or need to cock a bolt to get it to rotate in ????????????????

    I proper barrel should have about .001" interferance fit an should press in pretty smoth if the bore is lubricated an the edge of the barrrel pin bore is champhered properly .

    You need to set the head space properly If it takes all day so be it .

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    No Hope For Me 1biggun's Avatar
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    I cant even find were fulton makes a AK barrel or parts .

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    Gunco Member Bunker's Avatar
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    when im head spacing i take the bolt out of the carrierer with the go gauge and try and rotate it by hand , with the "no go" i put it in the carrierer and try and force it closed. never had any issues doing it this way.

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    No Hope For Me 1biggun's Avatar
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    Still trying to figure out what a fulton bcg an barrel is ?

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    Gunco Rookie darbish's Avatar
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    Thanks for the replies. I decided that the headspace was probably bad so I attempted to to fix it. Got it right on the first refit. :happy: now I'm not scared to field test it when the time comes.

    As a side note, but somewhat related, when you guys mate barrel components to a virgin barrel what's the step by step you use? Seemed to me the best idea was to get the hs the way I wanted it, install the barrel pin and then pressing on everything. If I didn't do the pin I think it would shifted as I pressed the rsb, correct?

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