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Thread: Remington 512 Sport Master

  1. #1
    Platoon Sgt Pat C.'s Avatar
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    Remington 512 Sport Master

    Little disappointed this mornings outing with vintage 512 Sport Master , Jammed every shot,had to hand feed each round of .22 LR.Hadn't had it out in over 20 years ,and it did that last time .Hoped it was the ammo but apparently not.
    Took it apart didnt find anything wrong but rim gets hung on feed ramp. Bolt just pushes it back down .
    This rifle belonged to my Father - n - law Dad . Doesn't appear it was ever fired when I got it mid 1990's
    It along with a number of other rifles were upstairs in an old house probably hadn't been touched in years .

    The pros
    Excellent sight picture fine bead and shallow U notch
    Excellent trigger pull

    The cons
    Jams
    Accuracy so so.

    25 yrd 10 shot group with Fiocchi performance 22 LR ,not very impressive for perfect bore and long barrel.
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  3. #2
    Command Sgt Major VanHahner's Avatar
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    Re: Remington 512 Sport Master

    Sounds like you need to tweak the spring under the follower ??
    U.S.M.C. Scout Sniper 67-68

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  5. #3
    Moderator 4570govt's Avatar
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    Re: Remington 512 Sport Master

    Pat, I'm sure a man of your talent will get that rifle running in no time.
    "Keep 'em in the 10 Ring!"

    Member M14 Battle Rifle Club Board of Directors


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  7. #4
    Platoon Sgt Pat C.'s Avatar
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    Re: Remington 512 Sport Master

    The lifter has a coil spring under it,all that seemed ok, back in the mid 1990's when I got it there was no evidence it had ever been shot.But sadly it lay for decades in a hot/cold upstairs room and never preserved .Barrel and receiver are plum brown. Under wood was perfect. Absolutly no trace of any sort inside. I think I fired it dozen times back then it did not feed correctly so it went to the back of the safe.

    Probably shouldn't have but I did drill and tap for weaver K4 scope back then but didn't install until I figure what's up.

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  9. #5
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    Re: Remington 512 Sport Master

    The grouping could be due to the standard open sights. Some of those are very fine in size and good for young eyeballs in general.

    The plum color of the finish I've seen on other Rem products, the metal that is blued and the type of bluing used I think had a relation to it more than age or storage conditions.

    Maybe try a different ammo, I've had Win HP's not feed well thru Marlin bolt, to big a flat with the HP is the reason I'm thinking.

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  11. #6
    Platoon Sgt Pat C.'s Avatar
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    Re: Remington 512 Sport Master

    Dug into this today ,the carrier and cartridge stop fit together via a tiny boss .
    With action out I could let cartridge stop rest on my knee and it functioned perfect.
    There is a staked adjustment screw,tried that with no luck.
    So I took it apart found hard dried garnished oil between the two ,critical that they move easily this is probably the problem. Will clean with acetone tomorrow and test.
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  13. #7
    Platoon Sgt Pat C.'s Avatar
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    Re: Remington 512 Sport Master

    Success , Cleaned the parts shown , tightened adjustment screw.Then backed off until I felt spring pressure release carrier. Worked good. Put back in stock ,then it jammed,so everything tore back down I find to find a nasty machine burr at mouth of feed ramp.
    Deburred and brushed out mag tube. Everything golden now.

    Test group decent but I moved sight too much .
    Second try was close ,followed by 9 shots that show the capability

    Rear sight is screwed down so probably not much WINDAGE adjustment ,will see.
    I plan to put the K4 back on anyway.

    I also found out the mag tube hitting forend before action seated .

    Need to relieve some wood in channel front .It has potential.
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  15. #8
    Platoon Sgt Pat C.'s Avatar
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    Re: Remington 512 Sport Master

    Shown is the pivot screw and location in frame , this screw adjust tension between carrier and cartridge stop.They should be tight enough to keep the two sandwiched together but loose enough so the carrier snaps up at proper timing so rear of cartridge pops up to load.

    This screw is factory staked and once adjusted needs restakedwith little punch into screw slot to hold.In this case factory stake dis not match what actually made the action cycle.
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