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Old 10-05-2019, 10:03 PM   #11 (permalink)
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Always wanted one of these. Why don't I ever find anything this rad at Goodwill...
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Old 10-05-2019, 11:54 PM   #12 (permalink)
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Originally Posted by XEMON View Post
as long as you stay away from air ...
with that air tank you'll top of at 230/250 fps ...
Why's that? Do these require CO2? I have the 12 gram plug for the lower tube as well. I don't mind using 12 grams if I can return it to stock class, but I'd definitely want some kind of quick changer.
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Old 10-06-2019, 09:03 AM   #13 (permalink)
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Why's that? Do these require CO2? I have the 12 gram plug for the lower tube as well. I don't mind using 12 grams if I can return it to stock class, but I'd definitely want some kind of quick changer.
The airways are too small for HPA.
All Sheridan are made for CO2 and "converting" them to hpa is more tricky than it sounds:
- drill out the valve
- fill the extra port on the valve
- drill out the transfer port between the tubes
- reinforce solder joint between the tubes
- plug the hole used for expanding the transfer tube
- drill out the bolt to match the transfer hole.

With all this, you might have it run ok on hpa.
Springs would be the next step. I'm still experimenting to find the right combo of springs ...

If you can run them on CO2, it is where they perform the best.
Bone stock, you will get 10 to 15 shots on a 12g.

If you are comfortable on the drill press and soldering, you can do it yourself.
Palmer can do it (very pricey) and some members here can can do it to (I've done it on lots of Sheridan).

But keep in mind, if you want something that runs good on HPA, you might be better off getting another pump and keep this one for CO2 ...

Sheridan are my favorite pumps, it's all I use now (pump and semi)
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Old 10-06-2019, 11:28 AM   #14 (permalink)
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The Speed Demon bolt is velocity adjustable so you don't have to go into the lower tube
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Pull the bolt and use an allen wrench down the bolt face hole, to open/restrict the air flow.
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Old 10-07-2019, 09:52 PM   #15 (permalink)
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Am I the only one who knows this?
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Old 10-07-2019, 10:31 PM   #16 (permalink)
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Am I the only one who knows this?
I definitely did not know that. How do I adjust the velocity??
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Old 10-07-2019, 10:55 PM   #17 (permalink)
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I definitely did not know that. How do I adjust the velocity??

Pull the bolt and use an allen wrench down the bolt face hole(on the front,of the bolt), turn the set screw(right/left) opening/restricting the air flow.
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Last edited by Carp13; 10-07-2019 at 11:02 PM. Reason: Clarifying....I think. :P
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Old 10-07-2019, 11:00 PM   #18 (permalink)
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Old 10-09-2019, 09:32 AM   #19 (permalink)
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Not all speed demon bolts are velocity adjustable, but the ones that came with the P68sc were.

They were also known to vent a little air around the small ball bearings at the adjustment screw. I prefer a RVA.
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Old 10-10-2019, 03:39 PM   #20 (permalink)
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Got a chance to clean all the old gunk and rust out of the internals and she's smooth as butter now. Unfortunately, there seems to be a leak around the front of the grip frame when using the constant air adapter. Seals up fine with a 12g, but since I've got the elbow soldered on I figured I'd use it as an open-class setup for now.

I think a seal may be missing from the constant air adapter where it meets the front of the valve since it seems to fit a bit loose. Anyone know where I can get a new one?
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