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Thread: RT Classic reg piston and Reg seat questions

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  1. #1

    RT Classic reg piston and Reg seat questions

    I have a couple regulator questions:

    1) While taking apart my RT i was unable to remove the regulator piston assembly without unscrewing the tiny allen set screw on the outside of the regulator housing. I thought this set screw was only to lock the valve into the Z - slot, does it do anything else? should it be so tight that it touches the regulator piston?

    2) In the video that came with the gun, the regulator seat appears to set down into a recessed area tight enough to stay on the regulator body. Mine does not do that, it will fall right out. The other side, the o-ring side, does fit tightly around the regulator valve pin, though. Is anything wrong with mine, or just a slightly different model?

    Here are some pictures. Thanks in advance for any help!
    Attached Images Attached Images

  2. #2
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    Apparently, the zlock pin has been changed to a set screw. If someone drilled it out too far and had to put a screw in there it would be possible to hit the reg piston if screwed in to far. Install the regulator valve pin all the way in. If it sticks out too far the reg seat oring will not seat in the groove. If you can get it down in there and it is loose then change the oring.
    Email me for low prices on ALL AGD Products and more. tunaman5@verizon.net
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  3. #3
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    Quote Originally Posted by Tunaman View Post
    Apparently, the zlock pin has been changed to a set screw. If someone drilled it out too far and had to put a screw in there it would be possible to hit the reg piston if screwed in to far.
    If that's a #6 setscrew, you might be able to put a 1/8" diameter roll pin back in there. Either way, you should check the fit so that it fits in the rail without touching the reg piston (grind it or file it), then install it with some red loctite. It shouldn't be a problem after that. The vibration from shooting will make a loose pin or screw move one way or the other.

  4. #4
    Quote Originally Posted by Spider-TW View Post
    If that's a #6 setscrew, you might be able to put a 1/8" diameter roll pin back in there. Either way, you should check the fit so that it fits in the rail without touching the reg piston (grind it or file it), then install it with some red loctite. It shouldn't be a problem after that. The vibration from shooting will make a loose pin or screw move one way or the other.
    Thanks for the reply. Is there any problem leaving it as a set screw? Once I backed it off a little the reg piston fell right out. There should be no leak potential there, right?

  5. #5
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    Quote Originally Posted by sdn137 View Post
    Thanks for the reply. Is there any problem leaving it as a set screw? Once I backed it off a little the reg piston fell right out. There should be no leak potential there, right?
    Does the reg piston still have an o-ring on it? Usually you have coax them out a little bit.

    You might want to post a pic of the reg seat you are describing.

  6. #6
    Quote Originally Posted by Spider-TW View Post
    Does the reg piston still have an o-ring on it? Usually you have coax them out a little bit.

    You might want to post a pic of the reg seat you are describing.
    Yes, the piston has an o-ring. I used the allen wrench to push it out. It would not budge initially, so I got the idea to loosen the set screw, which worked. When re-assembling, I wasn't sure if I needed to tighten that set screw back down.

    The pic in the op is of the o-ring side of the reg seat, and the black housing that it sits on. The video, and others on here, have mentioned that the reg seat should sit down in a recessed area in the housing. Mine has no area like that, the reg valve pin holds the seat in place. Here is another pic of the seat.

    Thanks for the help, sorry for the poor descriptions!
    Attached Images Attached Images

  7. #7
    Quote Originally Posted by Tunaman View Post
    Apparently, the zlock pin has been changed to a set screw. If someone drilled it out too far and had to put a screw in there it would be possible to hit the reg piston if screwed in to far. Install the regulator valve pin all the way in. If it sticks out too far the reg seat oring will not seat in the groove. If you can get it down in there and it is loose then change the oring.
    So the set screw is not factory? Even on the early models? I'm pretty sure this hasn't been changed, I've owned the gun for over 10 years. Basically though, it is not there to hold the reg piston in place, correct? As in it should not be that tight?


    The valve pin sits fine, and the o-ring side of the regulator seat sits fine. It is the other side of the regulator seat that just sits flush with the regulator housing, the black part. It does not sit in a groove at all, really there is no groove there.

    Thanks for the reply and the help

  8. #8
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    Quote Originally Posted by sdn137 View Post
    So the set screw is not factory? Even on the early models?
    I've had my classic RT since 2000. Bought it used. But mine has a roll pin in it just like my old 95 classic 68automag had.

  9. #9
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    I know for sure my lvl 5 classic valve as a set screw. As far as a RT's go, I've never seen one in person or on the forums.

    Quote Originally Posted by sdn137 View Post
    Is there any problem leaving it as a set screw? Once I backed it off a little the reg piston fell right out. There should be no leak potential there, right?
    none at all

  10. #10
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    Quote Originally Posted by Ando View Post
    I know for sure my lvl 5 classic
    How old is that one? In 05 it was a roll pin with a hard nose bolt.

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