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Thread: universal m-1 carbine ....help!

  1. #1
    Boolit Master
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    universal m-1 carbine ....help!

    took my "new to me" universal generation III- m-1 apart.

    and discovered a part that is damaged.

    it measures 1/4" x 5/8" x 3-9/16" and is made of plastic.

    also it has 4 pins molded onto the back side of this plastic piece and those 4 pins fit into 4 holes on the receiver.

    2 of the 4 pins are sheared off smooth.

    what does it do?

    can this whole piece be replaced with a steel one machined to its exact same size and instead of pins
    thread the holes and use red locktite on small screws? (being careful of course not to allow the screws to interfere with the action of the bolt.)
    or should i drill out the plastic piece and make new pins out of plastic rod ?


    after a total take down ...i now see that the holes are threaded and the plastic is cosmetic to fill in the missing wood material.
    any help appreciated...mike


    done some looking...the plastic block is called a "proprietary scope mount"
    and it came with the gun new ....since i'm not going to scope it ...does the plastic block need to be in there at all?
    Last edited by mozeppa; 08-05-2018 at 04:31 PM.

  2. #2
    Boolit Master

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    I'm not exactly familiar with the part you're discussing, but have worked on many Universal M1 Carbines. I'll be blunt-- if they were good guns they wouldn't have needed to be worked on. From your description it sounds like the scope mount part really isn't necessary and could just be tossed. If you want to replace it, try Gun Parts Corp. If it still functions, my advice is to sell it, especially if it's one of the later models with the dual recoil springs.

  3. #3
    Boolit Master



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  4. #4
    Boolit Buddy
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    I think you are correct, it sounds like a block to fill space where stock is inletted on left side of receiver. A couple companies made scope bases that attached to the left side of receiver so you didn't have to remove the peep sight to mount a scope. I've seen Uni-carbines with the drilled & tapped receivers, some have inletted stocks & some don't. Here's a picture of a Pachmeyer swing off scope mount made for an M-1.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check