Piston Uppers Anyone?

Discussion in 'Band of Glockers' started by JBJ16, May 19, 2007.

  1. JBJ16

    JBJ16

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    Did the conversion during the gun ban. Fired one round from magazine, succesfull bolt catch engagement.

    Would really want to try it on semi and full-auto after the ban. Test it for reliability,accuracy and parts longevity. If it works, it would be a nice upgrade to really short M16's.

    [​IMG]

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    Wanted to post this at Pinoyguns but didn't have the exclusive Password.:)
     
  2. kontra

    kontra

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    Is the piston upper a kit? Where did you get it and how much? Thanks!
     

  3. JBJ16

    JBJ16

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    Oh no no! I designed the mods after a lot of measurements of the upper receiver, action length and existing barrel. After the drawings, gave it to the machinist with the specific instructions for fabrication and assembled it myself.:supergrin: Sad to say, my gunsmith contacts were to skeptic and even quite condescending so as not to cooperate with me in the R&D. Only extensive firing would be the final test (maybe 200-500rnds?). Cost is minimal if you know what you're doing and you build it yourself. What d'ya think?

    [​IMG]
     
  4. emac

    emac

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    have tried posting it @ ar15.com? piston is the m16 of the next generation ;) but im still waiting for my gastube m16 to malfunction:)
     
  5. JBJ16

    JBJ16

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    Been thinking of posting it at Arfcom, but guys over there are rabidly pro DI (direct impingment)operation.After all its Arfcom. :hugs:
     
  6. kontra

    kontra

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    nice work! keep us posted on your reliability tests. you might want to try contacting some local governments for your project. some of them upgrades old m16 to be used by their local police. they might be interested in your design.

    you're right about arfcom. some are even skeptical at the hk416.
     
  7. rex_valerian

    rex_valerian

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    Two thumba up for Filipino ingenuity. Now if only Filipinos respected copyright laws, you could patemt this and get rich...

    Keep us posted. I'm sure more than a few of us would be interested in trying out your modification.
     
  8. jojo_G19

    jojo_G19

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    combination of the M14 and the AR :supergrin: :thumbsup:
     
  9. 3kings

    3kings SalingPusa

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    sorry for my ignorance...but how will it improve existing performance. less recoil?

    thanks
     
  10. Astra22

    Astra22

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    Galing mo bro! Why not try posting it in the Black Rifle forum here at GT. Be proud of your work of art.:thumbsup:
     
  11. JBJ16

    JBJ16

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    Recoil would be the same. Advantages are;
    1.Less heat in the action (no hot gas blown back into the bolt carrier)
    2. For short barrels in particular (10in and less) more reliable functioning due to better gas regulation (no opening up of the existing gas port) gas regulation is by the piston itself)
    3. Longer parts life (extractor spring, ejector spring) etc. Since these are not subjected to heat by the orig. gas blowback inherent in the orig. DI design.
    4. Cleaner BC/Bolt due to absence of gas blowback.

    Disadvantages I see are:
    1. Heavier unit compared to the orig. design (may be negligible trade off)
    2. For use in a longer barrel configuration, use of a heavy barrel (is a must in my opinion) to negate the torquing effect of the piston/gas block assembly on the barrel.

    ETA: The quest for reliability in this case is primarily for the heavy usage of the Firearm as an semi/automatic weapon with full confidence, if you intend to use the AR as a recreational target shooting tool mostly on semi-auto and a long barrel config., the orig design has proven enough.
     
  12. cebuboy

    cebuboy toy soldier

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    Good design, looks similar to the kit sold by ARES defense. Are you using the standard recoil spring and buffer? Where do you vent the gas? Is it self regulating? This is nice for VSBRs :)
     
  13. JBJ16

    JBJ16

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    Quite different from Ares since it is not drop-in. Piston is similar to AR18 and LWRC Rifles. And yer its self regulating but vents under the handguards. I have another design which would use the Std, Front sight assembly and designed to vent gas forward. :)
     
  14. cebuboy

    cebuboy toy soldier

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    Did you try out the HK design which vents the gas forward?
     
  15. JBJ16

    JBJ16

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    He he he not yet. Funds funds funds for the project:hugs:
     
  16. Alcoy

    Alcoy

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    Good job. Ang galing mo. Very similar to LWRC design. Have you seen their video? Their guns worked even after water submersion, etc. I am sure your design will be as reliable as theirs.
     
  17. JBJ16

    JBJ16

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    LWRC, ARES, mine, all patterned after the original Armalite AR18 piston/op rod setup. But my design is unitary, have to take off the gas block to disassemble. LWRC is a much better design, disassembly wise. Its up to the user how often you need to disassemble the piston/op rod setup.

    I certainly hope so. Have to test it extensively first.:supergrin:
     
  18. Alcoy

    Alcoy

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    Keep us posted about your test/s.
     
  19. kontra

    kontra

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    Gun ban is over.....

    any updates on the tests?