LG 200/300 Build help needed.

Discussion in 'Walther' started by Finn, Mar 17, 2020.

  1. Finn

    Finn New Member

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    Greetings from Finland, I like building airguns as a hobby and have built many from scratch.

    Lately I have been making drawings for Walther LG200/300.

    [​IMG]
    [​IMG]
    The idea is to build the 16 or 21 Joule version of LG200 for general target shooting use, maybe casual FT training.
    I have good overall knowledge of these guns but missing some critically important details,
    most of the dimension I think are close enough but it is uncertain if original walther parts will fit.

    Almost all dimensions were derived from walther parts diagrams and reading online Airgun Accuracy

    I have ordered a 180x60x25 mm aluminium brick for the frame of the gun, it should be here friday, but I will not start machining it until
    the 3d model is verified.

    Dimensions I think are correct

    -Frame length and width and hole positions
    -Pellet pusher dia 6 mm.
    -barrel mounting hole 12 mm.
    [​IMG]

    Some of the dimensions I am unsure of are:

    -Exaxt barrel to air cylinder distance (center to center)
    [​IMG]

    -Depth of valve seat surface (I will use flat type ptfe valve seal)
    -Regulator lip length and offset from center (part that pushes against valve seal and how far it is from regulator centerline).[​IMG]
    [​IMG]

    Regulator is important to get right if I ever want to use the original part or get lazy in the process and decide to buy it.

    I have already started making some parts including hammer, probe, cocking linkage and trigger parts.
    [​IMG]

    Havent decided on the barrel yet, for testing purposes anything I can find will do, preferably at least 420 mm.

    Not sure if I want to make the absorber, is it useful beyond 16 j power?

    If you can help me with dimensions, please do, I am a long time Walther fan and even thou this will not be a real Walther it could be nice to have a knockoff.
     
    pbrown and Ceathreamhnan like this.
  2. PA410goodshot

    PA410goodshot Active Member

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    It all looks very good, and if you can make it why not, but surely would be cheaper and less time consuming, to buy a second hand one.
     
  3. Finn

    Finn New Member

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    Time consumed making the gun is time not consumed making something useless, I like making guns so time does not matter here.
    I am not sure how someone can think it would be cheaper for me to buy it, material cost is about 50 euros for the complete gun.

    If someone is willing to sell me LG300 for 100 euros, I will buy it and forget this project.
     
    john79 likes this.
  4. john79

    john79 JEDI

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    50 Euros for a complete gun...Bargain i'll have 5 when your ready :D
     
    EV2_Hawke likes this.
  5. Finn

    Finn New Member

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    I can send you a cheap "kit" consisting of aluminium brick, spring, steel tube and few screws and washers.
     
    john79 likes this.
  6. john79

    john79 JEDI

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    I wish you all the best with this project ….keep us posted on the future development i'd like to see the end result mate :cool:
     
  7. Finn

    Finn New Member

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    I will post all the progress, now all I need is someone with walther gun to measure those few things for me and I can start making the frame.

    Turning the hammer
    [​IMG]
    Cutting the pusher link
    [​IMG]
    And cocking linkage
    [​IMG]
    Trigger parts making
    [​IMG]
    Quality control USSR style
    [​IMG]
     
    john79 likes this.
  8. eggie

    eggie Well-Known Member

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    I think Phil has just found a new best friend........ :)
     
    RobF and john79 like this.
  9. hmangphilly

    hmangphilly warm ember

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    Looks like he's gearing up for a corona virus lockdown
     
    john79 and eggie like this.
  10. Simonev2

    Simonev2 Member

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    If you build a offset cocking lever for a Lg300 xt I’ll be interested in one.
     
  11. Finn

    Finn New Member

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    Remember that I have never even touched a Walther LG so I have no guarantee that anything fits, this is where all of you can help.
    If you have any Walther LG (200, 210, 300, XT, 400) and digital caliper, measure any part you can and post it here or make a pencil drawing, it will all be appreciated and if my model becomes accurate, then I could maybe make special parts for others.
     
  12. PA410goodshot

    PA410goodshot Active Member

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    If the cost is that much to make one from scratch I am sure everyone will be flocking to buy one from you you could at least double your profit. :D
    I am first in line for one. ;)
     
  13. Finn

    Finn New Member

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    Remember, no more than ten people in the line in this day and age.
    I think I have a good model for the regulator, now I'm thinking about modifying it slightly, it is a bit of a stupid design from factory. Hoping that someone with regulator is reading and can post the sealing lip dimensions.
    [​IMG]
     
  14. hmangphilly

    hmangphilly warm ember

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    what's wrong with the reg design ?
     
  15. Finn

    Finn New Member

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    I think it is already a bit better in LG400 with external adjustment. One other thing is that the closing force on the valve goes down with the reservoir pressure but the force acting on the piston stays almost the same. In a Steyr regulator the shutdown is "forced" as the piston is directly connected with sealing surface, this I think increases stability because the seal can be very hard material. On a Steyr regulator the closing force increases slightly when reservoir pressure drops, it is just the opposite of Walther. In a real world those differences could be small enough to not have a notable effect but Walther regulator could easily be made so that you could adjust it without stock removal. Also the small M10 thread seems a bit weak if you were to free float the air cylinder.
     
  16. Finn

    Finn New Member

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    Heres my view of an externally adjustable LG regulator, at least the use of space is more efficient. [​IMG]

    Someone with the real gun, please contact me, project is not going anywhere without you.
     
  17. sven

    sven Active Member

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    Nice project Finn. I took some dimensions from my regulator.
    Barrel hole is for a 15mm barrel, not 12mm.
    Regulator lip (pip) = 2.60 high, 12.95 dia, centre is 10.275 from centre of regulator (by calculation of 3 individual measurements on the reg.

    I don't have an open block here, so can not give you the block dimensions you ask for.

    Good luck with the Walther project, I like your regulator design.
     
  18. SEDGLEY Ti

    SEDGLEY Ti Senior Member

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    So if you think a steyr regulator is better use one it's simply enough.:rolleyes:
     
  19. sven

    sven Active Member

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  20. SEDGLEY Ti

    SEDGLEY Ti Senior Member

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    berty177 likes this.

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