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bravo647 09-08-2006 02:26 PM

Turning a phantom semi auto
Hey Experts,

I've got a question. Can you make a phantom semi auto using cheap, easily accessible autococker parts? Also how hard would this be to do, has/ who's done it? Anyways let me know, I really love the feel of my phantom and sometimes i wish i had a second that was semi auto- plus it'd be a cool conversion to do yourself.


flashpoint 09-08-2006 02:49 PM

Scroll down for the electro phantom, cause this is all I know about semi phantoms.

incynr8 09-08-2006 02:50 PM

palmers (tornado, no longer made)

All did them.
AN old friend of mine designed a completely self contained grip frame with all the components inside as well, but I can't share the concept it's under patent process.

You can do it, but it usually requires some machining skill to make mounts and interface with the pump rod, often froma side slotted body (see the 'buzzard pahntom covnersion concept)

kidneythief 09-08-2006 03:14 PM

Lots of folks have done it.

Your main problem would be the 4-way location. The reason being the detachable style grip block would trouble the 4-way placement and the fact that without serious modification you'd be unable to mount a solid frame to it. That being said an external 4-way could be adapted or possibilty adding electronics to the gun.

If I had a spare Phantom laying around i would definatly try the conversion.


Rayodder 09-08-2006 04:22 PM

It is possible but not recommanded, Nelson valve design doesn't stand up well to the stresses of being turn into a semi.

jwigum 09-10-2006 10:45 PM


Originally Posted by Rayodder (Post 28851)
It is possible but not recommanded, Nelson valve design doesn't stand up well to the stresses of being turn into a semi.

I thought it wasn't very happy with higher rates of fire...

Lenny 09-11-2006 12:42 AM

I've heard that before, but I don't understand why it wouldn't work with higher rates of fire. I basically works like an inline Sheridan valve at the back of the gun.

If someone could explain to me the sciences, I'd be very happy to know.

Deus Machina 09-11-2006 03:33 AM

I think it's because the nelson design--aside from the ATS lines--has always been geared toward pumps. The input holes are smaller, the chamber is smaller, the hole through the power tube is much smaller than the port in a Sheridan valve, and there's quite a bit of turbulance from air going around a cup seal, through a few tiny holes, then straightening out again.

Robertsr 09-11-2006 06:40 AM

mostly the tiny holes that the air passes through to the power tube. There just isn't enough room for good flow-through, so the design is pretty restrictive.

I think that 3-6 BPS is about all that you can reasonably expect without significant drop off, and a decent pumper can do that already even without an auto-trigger.

It's still a cool project though. Be an iconoclast! Make one anyway. :)

Gumby 09-11-2006 08:27 AM

Actually it's not that there would be a flow problem with the Nelson valve design, a 1/16" hole is enough if it's straight like the Nelson's. Plus if you compare the ports between the Phantom and the AT-line they are very close already. The problem you'll actually run into is early parts failure. Even that isn't a good enough reason not to try it.

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