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Thread: 12 gram pump mag build

  1. #1
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    12 gram pump mag build

    so i have slowly but surely been building a pump mag.

    the plan:
    ule body
    classic valve
    rt on/off
    lvl 10
    agd pump kit
    agd 6 pak
    12 gram efficiency insert




    so i have read about people taking hack saws and such to valves trying to open them luckily i have access to a lathe. I knew i wanted to atleast try it for myself


    so here is a bit of progress i made on it.

    open says me:









    from there i decided to make my own insert, figured worst that would happen is i end up with a pile of chips.



    here it is:









    so i have aired it up no leaks thankfully, however i was testing with hpa and my velocity maxed out is only 230. so i need to go back and open it up some more currently its like the same size as the ID of the powertube.

    does anyone know the size of the ID that people were using with the plastic spacers?
    Last edited by captian pinky; 04-11-2014 at 08:06 PM.

  2. #2
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    wait, why test it with hpa if you're going to be using c02? shouldn't you be testing the insert with c02?

  3. #3
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    so that i can have the option to run with 12 grams or hpa

  4. #4
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    I believe you decreased the volume WAY too much, it looks like about a 66% reduction in chamber size, I think you will find that's too much.

  5. #5
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    i was trying to creep in on it. i know the ones that you made are much larger than the one i made. any suggestions luke?

    i also haven't finished my check valve yet either for the 6 pak. waiting on a couple parts in the mail.

  6. #6
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    Drill bunch of holes thru it. Swiss cheese! how did it shoot with CO2?

  7. #7
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    Drill it from the bottom with a .75 drill without going through the top, that will get you (real) close.

  8. #8
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    i did not adjust the velocity when airing up. This is with a classic on/off, lvl 10 and a macroline id of .082", 6-pak setup as a bottom line with no check valve, also had wave spring installed.

    with reballs

    crosman 12 gram.

    1 299
    2 302
    3 -
    4 284
    5 265
    6 301
    7 263
    8 286
    9 282
    10 287
    11 -
    12 292
    13 -
    14 240
    15 -
    16 228
    17 213
    18 -
    19 179 began to leak from lvl 10 when reset
    20 147
    Last edited by captian pinky; 04-11-2014 at 08:06 PM.

  9. #9
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    luke why do you say to open it up so large?

    i thought some people were having success with pretty small dump chambers?

  10. #10
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    Who else has made inserts other than the ones myself and Hill made? I used his design that was tested and proven to be an improvement over the stock chamber size. You can certainly do whatever you want.

  11. #11
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    Quote Originally Posted by captian pinky View Post
    does anyone know the size of the ID that people were using with the plastic spacers?
    3/8" ID nylon washers

  12. #12
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    http://www.automags.org/forums/showt...-valve-w-a-12G

    ^used 3/8" ID nylon washers

    http://automags.org/forums/showthrea...highlight=gram

    ^used nylon washers as well

    i think Hill was designing his to be more efficient with hpa if im not mistaken.

    i still think there is room for me to improve my setup. i may switch to a lvl 7 bolt and see how that compares. i also wanted to switch to braided line and devolumize that. anyone else have any more suggestions?

  13. #13
    Has anyone tried to put "fins" on the insert? like a heat sink? I thought about doing that to mine, to help gasifi the C02 and keep the chamber at a more consistent temperature?

    How about something like steel wool? anyone try something like that?

  14. #14
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    I heard someone say that the find wouldn't work because it's still contained in the same chamber. Not sure if that's true or not. I know people used to mill fins into the regs but I don't plan ok shooting that much co2 to worry about freezing the gun up.

  15. #15
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    Quote Originally Posted by jolt00 View Post
    Has anyone tried to put "fins" on the insert? like a heat sink? I thought about doing that to mine, to help gasifi the C02 and keep the chamber at a more consistent temperature?
    Fins give more surface area to collect or dissipate heat, but that heat needs to come from somewhere other than the chamber that its in. So, putting fins on the insert won't help, especially since the wall of the chamber is stainless steel which really doesn't conduct heat nearly as well as the aluminum insert would. The heat would be too slow coming from the outside of the body to the valve and through the steel/aluminum joint to the inner surface to make a difference.
    Except for the Automag in front, its usually the man behind the equipment that counts.

  16. #16
    Nice marker!

  17. #17
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    so i just got that roll pin in and of course it will take the strength of Hercules to get that pin in the 6 pak. any recommendations that are not risky.

    first attempt was duck tape and vise grips. it was close but would take a lot of work to get it to slide to the middle i think.

  18. #18
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    Quote Originally Posted by captian pinky View Post
    so i just got that roll pin in and of course it will take the strength of Hercules to get that pin in the 6 pak. any recommendations that are not risky.

    first attempt was duck tape and vise grips. it was close but would take a lot of work to get it to slide to the middle i think.
    Hot and cold...try putting the pin in the freezer for a while to shrink it...if that doesn't work do it again and look at trying to heat what you are putting it into to expand that.

  19. #19
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    putting it in the freezer will not shrink it the amount i need to make it smaller. its a roll pin and designed to be compressed and then put in.

  20. #20
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    use your drill press to press the roll pin in…same as a trigger pin or any other pin.

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