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Thread: M1a receiver mod's for build part one

  1. #1
    Sgt Major T44E4's Avatar
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    M1a receiver mod's for build part one

    In the following pictures posted by hawk for me is a series of modifications to bring a trashfield receiver closer into spec.
    They are not shown in the order of operation
    This is a customer receiver that is from the 90's done by me a year and a half ago.

    This is sop with me on each one that needs it.

    This first picture shows the setup for cutting out the takedown notch.



    Their failure to do this right has caused thousands of op rods to be bastardized to get them to fit. It causes premature rod failure, and necessitated the use of a hammer and screwdriver to remove the rod.
    I am sure that many of you have been there.

    THIS PICTURE (OF POOR QUALITY) SHOWS THE LINE OF MISS-MACHINING OR THE LACK OF IN THE NOTCH.

    THIS NEXT PICTURE IS OF TRUING THE BACK OF THE LEGS AT THE PROPER ANGLE
    THIS IS WHERE SPRINGFIELD FAILS BADLY, ONE OF THE MOST IMPORTANT SURFACES.


    LAST IN THIS SERIES, THERE WAS A RIDGE LEFT FROM WHERE THE AUTO SELECT TAB WAS AND IT WENT BACK TO THE LEG. THEY WOULD HACK UP THE STOCKS TO GET A FIT. YOU WOULD ALWAYS FIND THEIR FIELD GRADES WITH THE HEEL STICKING UP IN THE AIR FROM THE POOR FITTING.

    Last edited by T44E4; 29th October 2013 at 10:59 AM.

  2. #2
    Moderator wrwindsor's Avatar
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    Re: M1a receiver mod's for build part one

    Quote Originally Posted by T44E4 View Post
    This first picture shows the setup for cutting out the takedown notch.
    Their failure to do this right has caused thousand of op rods to be bastardized to get them to fit. It causes premature rod failure, and necessitated the use of a hammer and screwdriver to remove the rod.
    I am sure that many of you have been there.
    My current M1A NM has that problem. I'm about to send it off to Ted to get it corrected.

  3. #3
    Administrator 9th's Avatar
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    Re: M1a receiver mod's for build part one

    Thanks for posting and for the information. I know very little about machining, and I appreciate the lessons.
    Remember our fallen...


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  5. #4
    Section Leader SSD's Avatar
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    Re: M1a receiver mod's for build part one

    Something must have changed then, steps being skipped? Were there ever different manufacturing processes used? Mine was made in the 80's, and I may be blessed or something but I have had none of these issues. To my knowledge none of these mods were ever made to my rifle, and it is easy to see how critical they may be for a receiver to work right at all...

    This is what I call a great post!!!
    Regards, Jamie
    NRA Life Member

  6. #5
    Sgt Major T44E4's Avatar
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    Re: M1a receiver mod's for build part one

    Quote Originally Posted by ssd View Post
    something must have changed then, steps being skipped? Were there ever different manufacturing processes used? Mine was made in the 80's, and i may be blessed or something but i have had none of these issues. To my knowledge none of these mods were ever made to my rifle, and it is easy to see how critical they may be for a receiver to work right at all...

    This is what i call a great post!!!
    THE OPERATIONS DEPICTED IN THIS SERIES OF PICTURES ARE ONES SAI FAILED TO DO FOR WHATEVER REASON THEY HAD.

    I did not make any historical notes on the deviations.
    At the time I think I was seeing about three different producers of recievers with the sai logo's.
    I did not know when they were made, who contracted them nor did I care.
    I still see plenty of rifles out there that need to be done.
    The back of the legs done by them were so crude that they would destroy the match grade bedding they were done in upon removal from the stock.
    This receiver was a new old stock when I got it from the customer.
    This particular rifle is a standard grade build with Brookfield modified cylinder, piston and spring guide.
    It fit the standard stock and liner perfectly after the mods.
    Last edited by T44E4; 28th October 2013 at 09:55 PM.

  7. Thanks 4570govt, Hawk, SSD, louie, renisin thanked for this post
  8. #6
    Owner / Administrator Hawk's Avatar
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    Re: M1a receiver mod's for build part one

    This will be made a sticky as soon as it's been viewed enough here.
    Semper-Fi! Hawk
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  9. #7
    Section Leader SSD's Avatar
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    Re: M1a receiver mod's for build part one

    Three different producers with Springfield logos, WOW, that truly is something new. You really do learn new things here each day! This truly is fascinating, excellent.

    I wonder how many rifles were totally shoddy and how many shot well. Probably no information available on that one. Glad to hear you were able to correct the defects.
    Regards, Jamie
    NRA Life Member

  10. #8
    Moderator pitbulz21's Avatar
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    Re: M1a receiver mod's for build part one

    if u cant file it down beat it down with a hammer ... Shift+R improves the quality of this image. CTRL+F5 reloads the whole page.

  11. #9
    Staff Alumni Rainman's Avatar
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    Re: M1a receiver mod's for build part one

    This is "STICKY" material...

    Thank you for your continued support and expertise Mitch!
    BLUE LIVES MATTER
    Lord, make my hand fast and accurate.
    Let my aim be true and my hand faster
    than those who would seek to destroy me.
    Grant me victory over my foes and those who wish to do harm to me and mine.
    Let not my last thought be 'If I only had my gun."
    And Lord, if today is truly the day you call me home
    Let me die in a pile of empty brass.

  12. #10
    Designated Marksman Jersey Devil's Avatar
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    Re: M1a receiver mod's for build part one

    Interesting.
    I've heard of post-heat-treatment machining, is this a handful of examples of that?
    Being that some folks are completely nuts about grinding or machining anything after the receiver (in this case) has been heat treated, do you have any concerns about the heat treatment in any of these examples that you've presented here?
    Thanks.

  13. Thanks renisin thanked for this post
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