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  1. G

    GPR Vent Liner length

    I recently measured the length of four vent liners for a GPR .50 cal.: two Lyman and two RMC. I came up with four different lengths. Has anyone ever looked into the barrel thickness of the .50 cal. GPR at the touchhole?
  2. G

    Gun Case for Flintlock

    I have eyeballed the Unique Musket cases for three years and tonight I pulled the trigger and ordered one for my Lyman GPR.
  3. G

    Hammer moves/creeps

    Artificer, my lock does have the coil spring. Thank you for illustrations. I have had the lock out and I have tightened all screws exposed on the underside of the lock. I have not taken the bridle off (been afraid to). I will back off tension on the screws to see if that may be the problem. If...
  4. G

    Hammer moves/creeps

    M.D and Artificer, My technological abilities ended with cassette tapes and flip phones, regrettably I cannot post a picture of the lock innards. However, I will continue to examine the workings of the trigger/sear/hammer - prior to doing any alterations.
  5. G

    Hammer moves/creeps

    This issue was discussed somewhere but I cannot find where. Lyman GPR Flintlock. When pulling only the front trigger, the hammer will move/creep forward prior to falling. How do I remove the hammer movement/creep?
  6. G

    Lyman GPR primitive sight

    I had to remove the spring from the adjustable rear sight, place a plastic shim under and to one side and torque the screw down tight. So far, it has held zero.
  7. G

    Lyman flintlock disassembly

    I am glad the question was asked and that the video answer was provided. I learned something.
  8. G

    Another GPR Trigger question

    I seem to have stumbled onto an acceptable setting of the various adjustment screws. Thanks to all for the comments/advice. Another benefit to my efforts is that I am now over some of the fear of adjusting (messing with) my first flintlock.
  9. G

    Another GPR Trigger question

    Thanks Marmotslayer and Zonie. I will put it back the way it was for now.
  10. G

    Another GPR Trigger question

    I read about my issue on some forum but don't recall where. Other posts here come close to my question but not quite. I removed the gpr trigger plate (and lock) and adjusted (messed with) the screw between the triggers and the screw behind the set trigger and also the mainspring screw. I...
  11. G

    Sighting a Lyman GPR

    I removed the rear sight spring. Then I shimmed the back end of the rear sight to the right to stop lateral movement and tightened the screw until it bottomed out. Lastly, I filed the notch wider to get sight alignment and to gain daylight around the front sight. With the screw bottomed out, my...
  12. G

    lyman gpr adj. rear sight

    jdkerstetter - I actually appreciate the 'blunt' reply. I have one more modification to try and if that doesn't work the gpr adjustable sight will be history.
  13. G

    lyman gpr adj. rear sight

    In follow up - anyone with similar issue, do a single word search "adjustable". It turns out that movement in the GPR adjustable rear sight is a fairly common complaint.
  14. G

    lyman gpr adj. rear sight

    When screwed down the rear sight blade kicks to the left and the pinned front kicks right. Also, the left side of the sight blade is lower than the right side. At present, I have placed a thin plastic shim under and to the left ( 'L' shaped)just in front of the sight blade. My back up plan is to...
  15. G

    GPR Rear Sight Elevation Adj. Screw

    Can anyone inform me of the size of the Lyman GPR rear sight elevation adjustment screw? I presume it is metric.
  16. G

    Buying a Great Plains Rifle

    Avoid the GPR lesson I learned today as a new GPR/Muzzleloader guy - the flint leather provided by Lyman is cosmetic use only. It is far too thin and will allow the bottom of the jaw screw to impact on the stock. I have now made my own flint leather.
  17. G

    Buying a Great Plains Rifle

    5/8" is recommended in the rifle write up but 6S 3/4" x 3/4" is listed for Lyman. My .50 cal. GPR Flintlock arrived today. Very nice looking.
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