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Mental Medic

Regular Poster
  • Content Count

    247
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About Mental Medic

  • Rank
    Regular Poster

Additional Information

  • Airsofter since
    Not too long ago....
  • Country
    United States

Profile Information

  • Gender
    Male
  • Location
    Houston, TX
  1. Mental Medic

    KJW M4

    Yes, that is normal. Its the result of bolt catch wear.
  2. Mental Medic

    KJW M4

    Give it a shot if you feel comfortable with taking apart your FCG.
  3. Mental Medic

    KJW M4

    It will make the ROF more susceptible to variation due to cooldown. It will also be a little slower than stock.
  4. Mental Medic

    KJW M4

    Yes, I think so. I lost my manual a long time ago, so I didn't know its official nomenclature.
  5. Mental Medic

    KJW M4

    I will attempt to impart wisdom. Full auto issues should first be addressed through the fire control group. There is a slender piece of metal in the FCG that holds the valve open until the hammer is cocked. This piece interacts with the valve knocker. Over time, this slender piece of metal will cause the valve knocker to split on the thinnest area surrounding its pin by creating a camming action between it and the force of the magazine valve pressing on the valve knocker. In essence, I would say the full auto issues can be traced to the valve knocker. Check to see if its either broken or loose. As a precautionary measure, I would suggest removing the slender piece of metal referenced in an earlier paragraph, as it provides an irrelevant feature at the cost of severely reduced parts durability. That feature is the strength of the recoil. The recoil without that particular slender piece of metal isn't reduced too severely, but it is discernable. This is the only negative side effect of removing that slender piece of metal. The result of removing the slender piece of metal, and if necessary repairing/replacing the valve knocker, is a dramatic increase of shot to shot consistency. Edit: I realized I had failed to mention how exactly a broken valve knocker affects function on full auto. I've never given much thought on their relationship, or the relationship between issues with full auto and any other part in the gun. If I had to guess, I would say that the existence of the slender piece of metal messes with the timing of the FCG. It would release the hammer too early, which would cause it to ride forward along with the carrier. Specific causality aside, I would say that this slender piece of metal, overall, causes most of the known problems with the function and performance of the GBBR.
  6. Mental Medic

    KJW M4

    Yeah, you are going to need a new rubber band. And yes, it is what allows the bolt cup to reciprocate with the bolt. People had luck fabricating one out of electric tape in the past, if I remember correctly.
  7. Mental Medic

    KJW M4

    Thank you
  8. Mental Medic

    KJW M4

    Was wondering if anyone knew...... My stock valve spring broke (albeit after some extensive use) and I lost my manual. I don't feel like testing KJW's english comprehension.... For those who don't know, the parts numbers are listed in the back of the manual.
  9. Mental Medic

    KJW M4

    Does anyone know what the part number is for the little spring that pushes on the cut off valve/fps reducer/npas?
  10. Mental Medic

    KJW M4

    Cool, thanks for the input. I think I'll hold off on it until something breaks.
  11. Mental Medic

    KJW M4

    Does anyone have any experience with the Falcon hop up rubbers? The square-ish nub looked interesting and it's only $8 sans shipping at eHobby.
  12. Mental Medic

    KJW M4

    I've had a trigger problem before. Sometimes I couldn't switch it from semi to anything else and the trigger would lock up randomly. It turns out there was a small piece of metal stuck inside the lower getting lodged and dislodged in the various parts of the trigger group.
  13. Mental Medic

    KJW M4

    @ gi tye Your gas consumption problem has something to do with your floating valve. Take out your bolt carrier and look inside the bolt cup. There should be a black metal bar going across the cup's diameter deep inside. Take it out by unscrewing it with a small flathead screwdriver. After you pull the metal bar, the float valve and its spring will fall out. The valve is a small black plastic cylinder thingy with an o ring on it. It's probably lost its o ring or something.
  14. Mental Medic

    KJW M4

    There could be something lodged in your fire control group. Maybe shake it out or hose it out with some water and see if it does anything?
  15. Mental Medic

    KJW M4

    Buffer isn't mil-spec. My RS CTR's friction lock doesn't stop the wobble. It's AEG spec.
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