DIY M*CARBO Mosin Nagant Trigger Kit Installation

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  • j8064

    Garrett Co Hooligan #1
    Feb 23, 2008
    11,635
    Deep Creek
    The M*CARBO trigger spring kits I installed in my TC Compass rifles made a world of difference. When I saw they had trigger upgrade kits for Mosins, I figured for $20 what the hell - give one a try in one of my old relics. So I picked this 1931 Izzy as the guinea pig. :)

    Below is a YouTube link to the installation video. I won't bore you with the process. Installation is actually pretty simple.

    A few things I learned were:
    • Now I know exactly how the trigger assembly works in my MN rifles.
    • I had never thought about the "depression of the cocking piece" pointed out @ about 3:30 in the video. But it occurs in all of my Mosins. It kinda makes sense accuracy would be affected if the bolt is moving around before firing. After I installed the kit, that wobble is gone in this rifle.
    • Sanding and polishing the sear and cocking piece engagement surfaces is simple. I could have done more on my first pass, but the surfaces are much improved.
    • Two trigger shims come in the kit. There was so little side-to-side trigger play in this rifle I only used one.
    • The trigger return spring installation is easy and does make a difference. This rifle now has what feels like a modern trigger.
    • The "before" trigger pull on this rifle was ~ 6 lbs 10 oz. With the work done it's down to ~ 4 lbs 10 oz. And it's a LOT smoother. The kit was a helluva improvement!

    Here's the link to the installation video:
    https://video.search.yahoo.com/sear...8af21a5579afb5eaa83c03962de359f3&action=click

    Below are some before and after pics I took at various steps during the installation. This rifle is going back to tomorrow's Hooligan shoot to see what it does at the range.

    I think I've become a fan of M*Carbo stuff!

    :thumbsup:
     

    Attachments

    • 01 MCarbo MN Spring Kit Capture.jpg
      01 MCarbo MN Spring Kit Capture.jpg
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    • 02 IMG_0896 1931 Izzy w M Carbo Kit  SNIP.jpg
      02 IMG_0896 1931 Izzy w M Carbo Kit SNIP.jpg
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    • 03 DSC01102 Cocking Piece and Sear.jpg
      03 DSC01102 Cocking Piece and Sear.jpg
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    • 04 DSC01115 Sear Closeup.jpg
      04 DSC01115 Sear Closeup.jpg
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    • 05 DSC01107 Cocking Piece Closeup.jpg
      05 DSC01107 Cocking Piece Closeup.jpg
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    • 06 DSC01189 Sear Polished Close.jpg
      06 DSC01189 Sear Polished Close.jpg
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    • 07 DSC01190 Cocking Piece Polished Close.jpg
      07 DSC01190 Cocking Piece Polished Close.jpg
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    • 08 DSC01192 Trigger Retun Spring Installed Rear Close.jpg
      08 DSC01192 Trigger Retun Spring Installed Rear Close.jpg
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    • 09 DSC01194 Trigger Return Spring Front Close.jpg
      09 DSC01194 Trigger Return Spring Front Close.jpg
      36.1 KB · Views: 274

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