Disco double air tube - improved version - opinions wanted

[lloyd-ss]

I've been working with the Disco Double tube design some more to simplify it from the Disco Fever .25, and make it easier to install.  I switched to 7/8" O.D. tube (same dia as the Disco main tube) made out of 4130 chrome moly tubing.  The new tube almost exactly doubles the standard volume of the Disco. Twice as many shots, or more shots at higher power or bigger caliber.

The mechanical installation is strictly hand tools. The tubes are connected together at the front end with all new custom parts.  The barrel band is special.  The pressure gauge gets left where it is, as is.  The only hitch is that the stock has to be routed out forward of the gauge to accept the new tube.  Other than that, it is a bolt-in job. 

I think this could work pretty well for a hunting carbine, too. The main tube and barrel could be shortened, and a matching shorter second tube could be added, and you'd still end up with more air than original.

I'd love to hear some thoughts or suggestions about this project.

Thanks,
Lloyd-ss

[gene_sc]

I think it is an awsome design Lloyd. Hunters dream sort of speak.
 
Questions:
 
1. Does the guage adaptor and valve come with it?
 
2. Can a .22 barrel be used with this configueration?
 
3. What would you say the overall weight of gun is after complete?
 
4. Would there be any restrictions on using an M-Rod trigger group and with this design as long as stock has cut out for trigger group?
 
5. Can I assume that aftermarket breech' s can be used?
 
Enough for now..
 
Thanks
Gene

[lloyd-ss]

I think it is an awsome design Lloyd. Hunters dream sort of speak.
 
Questions:
 
1. Does the guage adaptor and valve come with it?
 
2. Can a .22 barrel be used with this configueration?
 
3. What would you say the overall weight of gun is after complete?
 
4. Would there be any restrictions on using an M-Rod trigger group and with this design as long as stock has cut out for trigger group?
 
5. Can I assume that aftermarket breech' s can be used?
 
Enough for now..
 
Thanks
Gene

Gene,
I am glad you like it, and I appreciate the comments! 

Here are the answers:

1. Does the guage adaptor and valve come with it?
-------The gauge and adapter that are on the Disco that is being modified will be reused.  In fact, the only part of the Disco that isn't reused is the fill nipple and it's adapter.  Everything needed will be included in the kit. 

2. Can a .22 barrel be used with this configuration?
--------- Yes, this will work with any Disco in any caliber, with stock or custom breeches, and with moderators or brakes, too.  It will have plenty of air for a high powered .25.

3. What would you say the overall weight of gun is after complete?
-----------  A stock Disco weighs about 5 lbs 2 oz.  This kit adds about one pound.

4. Would there be any restrictions on using an M-Rod trigger group and with this design as long as stock has cut out for trigger group?
--------- Yes, the M-rod trigger will work fine.

5. Can I assume that aftermarket breech' s can be used?
--------- Yes, it sure would.  In fact I have a special breech I will be installing very shortly and trying out.

Lloyd

[ezman604]

So it will remain at 2000psi just double the volume? Will you have the capability to anodize these or powder coat them to match the stock tube? What do you predict the cost to be. I'm very interested!!!!
Thanks Lloyd for your forward thinking and design work in airguns.
Happy Shooting!!!!
Dave
 

[lloyd-ss]

So it will remain at 2000psi just double the volume? Will you have the capability to anodize these or powder coat them to match the stock tube? What do you predict the cost to be. I'm very interested!!!!
Thanks Lloyd for your forward thinking and design work in airguns.
Happy Shooting!!!!
Dave
 

Thanks very much Dave!

Yes, technically, it will remain a 2,000 psi gun, but I will test all of the kits at 3,000 psi.  My calcs  (and the calcs of others) show the 3 screws that secure the valve assy to be the weak link. That can be fixed.

I need to line a finisher up.  Where I live, I think powder coat will be the least expensive option, but I am checking anodize, too.

I am not sure about the price yet (still talking to CNC guys), but probably between $100 and $200, which would include all the parts shown in the 3rd picture.

Possibly also have a "service grade" version that is unfinished and less expensive?  I am open to ideas.  The wide barrel band could have custom CNC engraving (including line drawings) on it if anyone was interested.

Lloyd

[MustangMike]

thats awesome and kits for this type of stuff is going to be a huge bonus to the airgun hobby..

lloyd have you thought of  using that gun kote stuff as  finish? it would be something that you could do in ur shop/kitchen if you can clear it with the lil lady.. other then the cost of the gun kote which im sure one can could finish a few airtubes and parts, you wouldnt have to pay anyone else for doing finishes.. heck i think these will be a big enough hit you could buy a cheap used oven to bake the gun kote in..

[lloyd-ss]

Mike,
I went back and looked at the GunKote thread.  It does look pretty good.  The tube is steel, the fill nipple is stainless steel, the end plugs and barrel band are aluminum, plus, there is a black Delrin protective cover.  I wonder how the GunKote will work on such varied materials (minus the Delrin), but no matter what, I ought to try it.  I  wonder if there would be interest in a budget unfinished version?
Lloyd

[MustangMike]

It couldn't hurt to have kits that are unfinished, I just thought the gun kote was a idea worth posting. Cuts out the middle man for doing finishes and puts more money in ur pocket..

[lloyd-ss]

Mike,
Yup, right you are.  I see that Midway has it in aerosol.  I needed a reason to get a Midway order together anyway.   
Thanks,
Lloyd

[MustangMike]

Ur welcome, gun kote is kind of pricey but one tube should handle more then a hand full of orders

[Dogbone]

I'm sure a few unfinished kits would sell,,, for folks who want to send the off to Shadow, for a camo finish, or try to finish themselves.  Great work there!

[Rescue35]

I've used Gun Kote on various steels and aluminums and the color is consistant. I'm color blind and shade variations show up big time for me.

I would think that there would be interest in a kit that is in the "white" for people who have or want to camo there hunting gun.

As for a shorter version I would wait and see if there is enough interest. At just over 5lbs it is still a light rifle for hunting.

[Doglegjack]

You always can use that word "Options"

Think I would like mellow yellow with racing stripes.

DogLegJack

[Build Em Better]

I have been following this thread and I must say - Lloyd SS - Sir, you have it going on.
If I could change one thing, it would be to have your brain. 

Someone else posted you just had a Birthday, Happy belated Birthday Sir.
People like you inspire us all....you have me. Thanks

[lloyd-ss]

I have been following this thread and I must say - Lloyd SS - Sir, you have it going on.
If I could change one thing, it would be to have your brain. 

Someone else posted you just had a Birthday, Happy belated Birthday Sir.
People like you inspire us all....you have me. Thanks

Thanks very much!  And yes, it is birthday time for me, even though it's long past the time when I wanted to start skipping them.
I do appreciate all the feedback about the double tubes for the Disco.
Lloyd

[sawtoothscream]

i want it. would make the disco much better for winter hunting. plus the added weight would be great IMO.  deffinatly will keep an eye on this.  how hard is it to install? 

[lloyd-ss]

i want it. would make the disco much better for winter hunting. plus the added weight would be great IMO.  deffinatly will keep an eye on this.  how hard is it to install? 

Mechanically, its very easy to instal with only a few hand tools.  The stock does need to be routed out to accept the extra tube, and that will be the hardest part of the installation.
Be careful what you wish for, LOL.
Lloyd

[newguyontheblock (Nathan)]

This looks AWESOME!!

One quick concern/test is that when we played paintball with CO2 guns is that every now and again a O-ring would freeze and fray and break and release all the CO2,  What is the possibility of CO2 degrading any of the new parts in this system

Other than that this is sort of epic haha

[lloyd-ss]

This looks AWESOME!!

One quick concern/test is that when we played paintball with CO2 guns is that every now and again a O-ring would freeze and fray and break and release all the CO2,  What is the possibility of CO2 degrading any of the new parts in this system

Other than that this is sort of epic haha

Nathan, Golly, I really don't know.  I have no experience with bulk fill CO2, but all of the new o-rings in this double tube application are static, so I would not expect any problems.  However, the passage that ties the two tubes together is very small in diameter so there could be a venturi effect if it was filled at a fast rate and that could create localized cold spots during filling...I am not sure.
What do you think?

[darryl]

lloyd, I don't even own a Disco, but this mod is fascinating. To think of the possibilities for shot count and energy in .25...just excellent. Will you offer a a complete .25 version for sale (with a full shroud, maybe)?
looking good, man,
darryl