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 Post subject: Discovery Tube length?
PostPosted: Thu Jun 01, 2017 8:25 am 
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If a 2250 tube is as long as you can use that's still considered a pistol, i read it's 10.50" from end to end. If I use a 10.50" discovery tube and adding the fill assembly to it.it would make it over 10.50". considered illegal?

Thanks

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PostPosted: Thu Jun 01, 2017 9:18 am 
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As long as your barrel is either over 18" or you have put a stock 14.5" barrel on it with a carbine stock should make it a rifle instead of a pistol so no longer rpal. Apparently the RCMP go by the serial number on the tube. that's my understanding anyway. There is a sticky about this topic, maybe in the modding section I think?

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PostPosted: Thu Jun 01, 2017 9:23 am 
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I want it in pistol form...i was thinking of getting a 10.50 Disco tube.
.

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PostPosted: Thu Jun 01, 2017 9:29 am 
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Canadianguy wrote:
I want it in pistol form...i was thinking of getting a 10.50 Disco tube.
.


2250 is still a pistol. According to the FRT. You need to use a 2260, or a disco. Whatever the model number says. But if you want it to be OVER 500 fps, you need to have it 26" OAL. Kim probably can cut the air tube down.

Image

W/o the stock it still doesn't meet the requirement of a NR. even with a 10.1" barrel its 1/2" short. Fill assembly wont add to the length because they go by the barrel.


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PostPosted: Thu Jun 01, 2017 9:34 am 
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Ok......i just trying to find out how long can the tube be for in pistol form sub 500?

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PostPosted: Thu Jun 01, 2017 9:52 am 
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Canadianguy wrote:
Ok......i just trying to find out how long can the tube be for in pistol form sub 500?


Any length for Sub 500. And you wouldnt need to run super high pressure so really you could just use a 2240/2250 maintube with a disco fill and 2240 valve with a disco valve cap and keep it around 1100 PSi. Maybe more being you might pass the stamping area. The thickness of the tubes are the same with 2260/2240/2250 as a disco.


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PostPosted: Thu Jun 01, 2017 9:58 am 
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I thought the tube could only be a certain length? Around 1100 thanks! Can i use a stock 2240 hammer spring with HPA at around 1100? My hammer weighs about 43 grams too.

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PostPosted: Thu Jun 01, 2017 10:05 am 
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Canadianguy wrote:
I thought the tube could only be a certain length? Around 1100 thanks! Can i use a stock 2240 hammer spring with HPA at around 1100? My hammer weighs about 43 grams too.


If your going sub 500 FPS, no real limit. HECK I just use a 2240 maintube. The stamping limits the max pressure you can run, but with a stamped maintube keep it in Co2 pressure. Unless you can extend the valve over the stamped areas. Wouldn't have to use a disco maintube. Just will have a limited reserve. That's why I went bottle with a direct line to the valve. Bypassed the pressure of the maintube.

You should be fine with a 2240 spring at that pressure.

I might make a 2240 HPA.


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PostPosted: Thu Jun 01, 2017 10:33 am 
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I don't want valve lock what i'm saying lol I was going to keep it hpa....I'm going to use a 10.50" Disco tube so there is no stamping problem and is already threaded.

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PostPosted: Thu Jun 01, 2017 2:40 pm 
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If you have the disco tube, do you have the pinned disco valve as well? If so you could safely fill it to disco levels, 2000 psi I think?
Hopefully you have a chronograph so you can find the optimal hammer spring tension to get the fps you want, not too slow but not over the limit either. If I was you I'd drill the rear end cap on your tube and tap it for a bolt to be able to adjust your hammer spring tension. At 2000 psi you may need a stronger spring to avoid valve lock, but I doubt it, as long as you have the bolt for adjusting spring tension turned in enough. I'd probably recommend getting a 1322/77 hammer spring though, would probably work better.
Running at 1100psi should be no problem for your 2240 spring, should work out about right, since hpa shoots faster than co2, so having that weaker spring will keep the speed down. You won't get many shots though! Going to 2000 psi and a stronger spring will give you a more useful gun imo.

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