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Thread: RIA MS - Barrel Gap

  1. #21
    Join Date
    14th August 2016
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    Quote Originally Posted by pblanc View Post
    My relatively new Rock Island Armory full-size "Rock" .45 ACP has a gap that is identical in appearance. It has not caused any apparent problems.
    Yea, it seems fine.

  2. #22
    Join Date
    25th September 2006
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    If you have a 0-1" micrometer, another way to get a fairly good measurement of the headspace is to:

    • Measure the length of a spent case (one whose primer is not above the case head)
    • Clean the chamber - especially the stop shoulder
    • Chamber the case, making sure it firmly contacts the stop shoulder
    • Measure the hood-to-case head distance with your feeler gauges
    • The sum of those two measurements = headspace (within a few thousandths)
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
    Last edited by niemi24s; 5th February 2017 at 11:15.


  3. #23
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    25th September 2011
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    I finally got around to cleaning the Brown that has "the gap" but with the barrel hood barely touching the breach face. I used my Clymer Go Gage that is slightly oversized at .8983 according to my neophyte micrometer skills. The hood-to-gage distance seems to be around .001. The smallest feeler gauge that I have is .0015 so my lousy measurements involve a bit of guessing and measurement voodoo. Rubbing my finger across the go+gage plus the feeler gauge and hood suggests the gage combination is slightly proud of the hood where when rubbing without the feeler gauge in place, the hood feels slightly proud of the go gage.

  4. #24
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    25th September 2006
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    Quote Originally Posted by Pyrenean View Post
    Rubbing my finger across the go+gage plus the feeler gauge and hood suggests the gage combination is slightly proud of the hood where when rubbing without the feeler gauge in place, the hood feels slightly proud of the go gage.
    Sounds like the headspace on this gun is OK.
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

  5. #25
    Join Date
    14th August 2016
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    Haven't forgotten. Checked a few hardware stores and even Mal Mart and I couldn't find a digital caliper in stock anywhere. Still got one place to check.

  6. #26
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    Quote Originally Posted by Warbirdnut View Post
    Haven't forgotten. Checked a few hardware stores and even Mal Mart and I couldn't find a digital caliper in stock anywhere. Still got one place to check.
    Save yourself some grief and just buy this online http://www.igagingstore.com/6-Digita...x-p/205450.htm

  7. #27
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    14th August 2016
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    I've heard some good things on line about Igaging. Thanks for the suggestion!

  8. #28
    Join Date
    2nd June 2004
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    I had a digital caliper once and I hated it. Despite showing four significant digits (to the right of the decimal point), it's only accurate to three. It ate batteries. Since a dial caliper is just as accurate, and doesn't need batteries, I reverted to using a dial caliper several years ago and I've never regretted the decision.

    http://www.harborfreight.com/6-inch-...per-66541.html
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside

  9. #29
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    Same problems I had until I found the good one. Better ones can be had for $200+

    I still get out the Vernier to confirm from time to time, but the Igaging digital has always been dead on.
    Last edited by Mark75H; 18th February 2017 at 09:37.


  10. #30
    Join Date
    25th September 2006
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    I'm even more old-fashioned than Hawkmoon with nothing but vernier slide calipers in my tool chest. The only disadvantage of this type for the newcomer is learning to read the vernier. FWIW, here are the four different types of slide calipers:

    • Vernier
    • Dial
    • Mechanical Digital
    • Electronic Digital
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]

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