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Pr900w Mag Fix

Discussion in 'Technical' started by nobby1991, Nov 2, 2021.

  1. nobby1991

    nobby1991 Well-Known Member

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    hi all. just a quickie, does anyone know of a video related to fixing the pr900w mag as its always jamming on me. i have to keep getting a twig and poking the pellet out backwards help meee
     
  2. Lostkiwi

    Lostkiwi Tomorrow will be a good day.

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    I've found them to be very pellet fussy.
    Falcon Accuracy Plus work very well in my experience. Anything that doesn't have a rounded head seems to jam. They also seem to prefer shorter pellets.
     
    Wing Commander likes this.
  3. nobby1991

    nobby1991 Well-Known Member

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    iv tried flats iv tried points iv tried domed all seem to jam apart from jsb exact..... but the gun dont like them that much.
     
  4. jchu_1988

    jchu_1988 3d printing accessories for air rifles and pistols

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    I found that backing off the centre screw by 0.5 turn helped with rotation. Also it was quite easy to disassemble and put back together. Might need a little of grease.
     
  5. Lostkiwi

    Lostkiwi Tomorrow will be a good day.

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    I also did the same. Backed off screw on the clear side 1/4 turn, then wound in grub screw on other side to lock it in place.
     
  6. nobby1991

    nobby1991 Well-Known Member

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    its not rotation that seems to be the problem. the pellet is dropping its nose and catching before its clear of the mag upon pushing the probe home. irritating as can be. it seems like the rotational part needs to be pushed forward so its like seamless transition between mag and breach. Mabie im just over thinking it.
     
  7. jchu_1988

    jchu_1988 3d printing accessories for air rifles and pistols

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    Do you have a video?
     
  8. nobby1991

    nobby1991 Well-Known Member

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    no havent sorry il see if i can get one to do it quick and post a pic
     
  9. nobby1991

    nobby1991 Well-Known Member

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    This one seemed to jam to the side rather than down
     

    Attached Files:

  10. Lostkiwi

    Lostkiwi Tomorrow will be a good day.

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    In my opinion it's a fundamental design flaw.
    The pellet is under permanent pressure to the side so the slightest imperfection in the head or slightest misalignment and the pellet jams on the exit. With the waisted shape it also allows the spring tension to push the pellet sideways as it goes through further aggravating and misalignment.
     
  11. nobby1991

    nobby1991 Well-Known Member

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    okay so correct me if im wrong but if i took it apart and put a taper on the inside of the mag so even if the pellet did end up at that angle it would just slide on through rather than jamming
     
  12. nobby1991

    nobby1991 Well-Known Member

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    You can see the mark it has left on the top side of the head where its jammed
     

    Attached Files:

  13. nobby1991

    nobby1991 Well-Known Member

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    ignore the fact its a naff pellet i just grabbed some that i knew would jam instantly lol
     
  14. Radlad

    Radlad Keyboard Hero

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    Have you deburred and cleaned up the barrel breech opening? It may be a burr there that is causing the trouble rather than the mag.
     
  15. flatrajectory

    flatrajectory Keyboard Hero

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    It is well known that these smk Chinese mags are a flawed design, just bin it and but a Carm magazine.
    Pete.
     
  16. nobby1991

    nobby1991 Well-Known Member

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    i have seen them 3d printed ones was tempted but i dunno. also the pellet dosent even make it out of the mag for it to be a problem with any other part on the gun apart from the probe.
     
  17. Fatbob59

    Fatbob59 Busy Member

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    Is the probe bent , it would tip the pellet rather than a straight push ?
     
  18. nobby1991

    nobby1991 Well-Known Member

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    no the prob is not bent. there is a slight bit of play in it, because of that i push it back home from the rear rather than from the bolt so its more of a forward push rather than a cantered slide.
     
  19. jchu_1988

    jchu_1988 3d printing accessories for air rifles and pistols

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    I think the nub that guides that aligns the pellet might be worn or worse broken.
    Carm's design using a much weaker and possibly custom spring which reduces the force applied to the pellet should reduce the issue.
    Try loading a half mag to see if it makes any difference, reduces the spring tension.
    They really should use constant force springs but those are expensive in comparison.
     
  20. foxtrott

    foxtrott I'll be back

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    Hi I was talking to @Halinfax about this I'm sure he has done a thread about tuning the mags
     

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