Headspace Question - Page 2
Page 2 of 2 FirstFirst 1 2
Results 16 to 19 of 19
Like Tree4Likes

Thread: Headspace Question

  1. #16
    Senior Member

    Member #
    26909
    Join Date
    Oct 2014
    Posts
    709
    Liked
    312 times
    The bolt carrier should close on a go gauge with no more than 33 pounds of gentle pressure. The carrier should not closes on a no-go with up to 66 pounds of gentle pressure. The carrier has closed if it has contacted the trunnion on the left side. So if you are putting less pressure then that on the carrier and it is closing on the no-go then that does not sound good. I think you are correct to be concerned.

    Have you made sure that the bore is completely spotless when checking headspace? Same question for the bolt face, and the lugs on the bolt and trunnion. The difference between a go and a no-go gauge is about .0045" so debris the size of a human hair could cause issues.

    You said there is still 1/4" of clearance from the triangle lug on the bolt to the trunnion with a no-go gauge, that sounds correct when just using the bolt. How close does the triangle lug come to the trunnion using a go-gauge? In my experience there is usually a small 1-2mm gap on factory rifles but that still provides a full lock with the bolt carrier.

    What country made your trunnion, bolt, and bolt carrier? Are all three numbers matching from the same original rifle?

  2. #17
    Senior Member

    Member #
    29647
    Join Date
    Aug 2015
    Posts
    604
    Liked
    65 times
    Sounds like after the first rounds were fired the barrel pushed forward up against the pin, I dont know why this happens but remember reading about the possibility of it happening on home builds.

  3. #18
    Junior Member

    Member #
    10952
    Join Date
    May 2008
    Posts
    9
    Liked
    0 times
    The locking lugs in the trunion and bolt should ALWAYS be lapped to each other before head spacing! Otherwise any bur or paint could throw the gauge off, and it is important to insure that BOTH lugs share the load equally.
    Professor Emeritus, School of Hard Knocks and Sharp Blows to the Head.

  4. Remove Advertisements
    TheAKForum.net
    Advertisements
     

  5. #19
    Senior Member

    Member #
    27874
    Join Date
    Jan 2015
    Location
    Out West
    Posts
    1,855
    Liked
    4947 times
    I have nothing to add as I agree with the advice here.

    Mostly I want to thank Walleye for that Garand link, I am going to use it during my yearly Garand teardown. Thanks.

 

 
Page 2 of 2 FirstFirst 1 2

Sponsors

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. AK-74 Headspace question
    By voron in forum Build It Yourself
    Replies: 5
    Last Post: 05-15-2012, 08:38 PM
  2. M76 headspace question
    By Cofaler in forum Build It Yourself
    Replies: 3
    Last Post: 07-29-2011, 02:18 AM
  3. headspace question?
    By ClayC in forum Build It Yourself
    Replies: 5
    Last Post: 02-18-2011, 06:39 PM
  4. headspace question
    By freefalle7 in forum Build It Yourself
    Replies: 1
    Last Post: 03-30-2009, 05:06 PM
  5. Another Headspace question
    By rsm in forum Build It Yourself
    Replies: 10
    Last Post: 09-08-2008, 11:03 PM

Search tags for this page

ak bolt replacement without headspace

,

ak hammer hitting the bolt carrier

,

ak out of battery headspace

,

headspace of akm -47

Click on a term to search our site for related topics.

Tags for this Thread