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Thread: Bolt Lug Tolerance/Spec

  1. #31
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    Quote Originally Posted by WS6 View Post
    The rules here are to contact the company first. I have now done that.

    Rubber City Armory originally, upon hearing my issue (but no measurements) stated that while they would do whatever I wanted (refund, swap out, etc.), I might be best to "just write them off", and that perhaps I and others like me were "picky", as most of these types of returns "work just fine" in their guns. I was informed that AK-47's have a lot of slop and can work with a lot of gunk in them and that I may be better served to consider one.

    Upon hearing the measurements of 0.280", they agreed that this was a little off and seemed more inclined to my way of thinking.

    I had agreed to send in the bolt for a swap...

    ...but after a good hard work-out this AM, and thinking about the things that have transpired, I decided against returning the bolt for a new one as I had discussed on the phone.

    The carrier is nice, and I'll keep it. Bolt can go in the trash. I would rather run a known quantity from BCM or Daniel Defense, as I have literally never before encountered a bolt out of spec to the point that it caused administrative unloading of the weapon to require goodly effort. (Feeling like trying to extract brass-case after shooting a lot of steel). Chamber is not the issue as my other bolts work fine, including one of the previous one's from RCA. Their products seem to be "all over the map" when it comes to machining, and I'd just rather not.

    Great idea. I could care less what is wrong with that bolt. Their response tells me what I need to know. Sometimes the education costs money as in your case. Hopefully others will learn from your experience and avoid this business.
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  2. #32
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    WS6, how does that bolt function in your DD carrier?

  3. #33
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    Quote Originally Posted by mtdawg169 View Post
    WS6, how does that bolt function in your DD carrier?
    I did not test it, but the Noveske bolt functions fine in the RCA carrier, so I have no reason to believe that the carrier has anything to do with it.

  4. #34
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    Quote Originally Posted by DBR View Post
    I just measured a new BCM bolt that I bought about this time last year.

    Lug length=.278
    Lug width=.098
    Lug height=.110
    Face recess=.125

    All measurements +-.001

    If dimensions check out, is ejector binding in its hole and putting pressure on cartridge?
    I believe the actual spec is .278" and .125"

    But it is really the measurement from the bolt face to the back of the lugs that matters for headspace purposes.

    Perform a normal headspace check with this bolt and a "good" bolt.

    That should tell you what you need to know.
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  5. #35
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    Quote Originally Posted by Clint View Post
    I believe the actual spec is .278" and .125"

    But it is really the measurement from the bolt face to the back of the lugs that matters for headspace purposes.

    Perform a normal headspace check with this bolt and a "good" bolt.

    That should tell you what you need to know.
    I lack the gauge. However, A factory Noveske and a factory Daniel Defense bolt work interchangeably in either factory DD/Noveske gun, and this bolt works well in neither. That tells me what I need to know in "trash it", albeit not specifically.

    The carrier is a work of art and I will keep it. The Bolt? Who knows what it's worth, but I don't want another, so I'll eat that. This being said, the carrier will have ended up costing me $200. That's the same thing JP charges for a comparable product, so I'm not butthurt about the cost of it.
    Last edited by WS6; 07-16-13 at 22:14.

  6. #36
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    Quote Originally Posted by WS6 View Post
    I did not test it, but the Noveske bolt functions fine in the RCA carrier, so I have no reason to believe that the carrier has anything to do with it.
    That eliminates the carrier / cam pin track as an issue. Just to satisfy curiosity, it would be interesting to know if the RCA bolt functions in a different carrier. Sort of a final step in the process of elimination.

  7. #37
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    Quote Originally Posted by mtdawg169 View Post
    That eliminates the carrier / cam pin track as an issue. Just to satisfy curiosity, it would be interesting to know if the RCA bolt functions in a different carrier. Sort of a final step in the process of elimination.
    I did not test it, but if the other bolts function fine in the RCA carrier, then it seems a moot point, however, I will test it when I get home. Headed to the gym, now.

    *Fwiw, I also put the Noveske extractor in the RCA bolt. No change.

  8. #38
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    Being that problem is only with a round in the chamber, you probably have a headspace issue. This can change with ammunition.

    Depending on how the brass is sized, it may get worse or get better.

    In reloading, if you mash your full length sizing die all the way down until it contacts the shell holder, you are making minimum spec cases. They should fire and chamber in any rifle. If you are measuring fired cases, and shoulder bumping them down .003, they may only chamber in the particular rifle they were fired in, or rifles that have a looser chamber.

    When I got into reloading, I understood a lot more about headspace. To the point I would never buy a stainless barrel, or one in a rifle that I intended to shoot for groups, without buying a matched bolt with it.

    Playing Johnny Plate Carrier at the seven yard line, you'll find out it doesn't matter. When trying to lower standard deviation into the single digits, it matters. How your brass seals to the chamber is very important.

    That being said, if the rifle is on the short side of headspace, it may shoot very good provided all of the other elements are good. Rifling, crown, concentricity of barrel threads etc.

    It may, and probably will, suffer more malfunctions as a result.

  9. #39
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    That's my thought. I'll keep the bolts in the guns they came in, or buy milspec next time.

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