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how do I downgrade a gas shotgun

  • 14-01-2009 7:42pm
    #1
    Turncoat
    Closed Accounts Posts: 534 ✭✭✭


    How do you downgrade a green gas powered shotgun. This shotgun that I want to buy from my friend in the states said that it's single(not burst) shot chronos at 420fps with a .20g 6mm bb. Way over the joule limit. I really really really want this shotgun, so some advice please?


Comments

  • #2
    Masada
    Banned (with Prison Access) Posts: 11,001 ✭✭✭✭Masada


    It might not be that high by our own temperature, do you know what kinda climate he's in?

    theres a few things you can do to drop the FPS a bit, you can add a collar inside the gas port to reduce the diameter of it, resulting in a lower power.,


  • #3
    spicymchaggis
    Registered Users, Registered Users 2 Posts: 2,878 ✭✭✭spicymchaggis


    whats it chrono at with 134a gas?


  • #4
    Turncoat
    Closed Accounts Posts: 534 ✭✭✭Turncoat


    He's in Florida and the shotgun is a double barreled sawn-off shotgun. custom made - full metal and wood. I want that shotgun, a guitar case and change my name to El Mariachi or Badassiel. This shotgun will fulfill my Desperado movie collection craving.


  • #5
    Turncoat
    Closed Accounts Posts: 534 ✭✭✭Turncoat


    spicymchaggis wrote: »
    whats it chrono at with 134a gas?

    I have no idea but I will ask my friend to do a reading with 134a gas as well.


  • #6
    Stercus Accidit
    Registered Users, Registered Users 2 Posts: 8,758 ✭✭✭Stercus Accidit


    As Richie, or matlock as he's calling himself now said, adding some way of choking the flow of gas is the way to go.


    Or if there is a striker valve it can have a stronger spring installed, or a weaker spring in the hammer.

    Easiest is just adding an o-ring or similar to reduce the gas flow as above.

    Unless its under 1 joule with hfc134a, thats what he'll have to do before sending it over.


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  • #7
    Frank the Manc
    Registered Users, Registered Users 2 Posts: 947 ✭✭✭Frank the Manc


    you can make a low flow valve using chem-metal or quick steel, basically filling up the hole the gas flows through and drilling out a new hole.

    start small and work your way up, measuring the fps after every increase in diameter drilled.

    make sure to thouroughly clean the valve of any dust before re-inserting.


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