9mm Discovery based valve gives over 80 foot pounds

9mm Discovery based valve gives over 80 foot pounds

Joined: September 6th, 2006, 3:27 am

November 1st, 2011, 6:05 pm #1

The most powerful gun I have ever built.

Barrel is 14" with a 13" stainless air tube.

The valve was located 1/2" farther from the end then the normal Crosman location, so the hammer stroke is a full 1/2" longer.

The Disco valve was highly modified in pretty much every way possible.

The spring is .041 and 1 1/2 longer then the stock Discovery spring.
Has a Don Cothran rear cocking kit, with my own custom hammer.
The frame is phase 3 with an adaptation of the PPG phase 2 drop sear system.

The port seal is 5/16 poly.Surprised me with this power, as I had been using 3/8 poly tube for big bores....but the thin wall of this 9mm barrel prevented it's use.

I credit most of the huge power to the hammer / spring system, it really opens that valve and keeps it open more than long enough.
I think this gun could use a lot higher starting fill pressure, but I am limited to a hand pump...........scuba tank some day !

Shot string with 77.8 grain eugin and 3200 psi fill is :
Shot 1. 685 =81 FPE
shot 2. 630 =68 FPE
shot 3. 597 =61 FPE
shot 4. 465 =37 FPE


YES, THIS IS FOR TO FILL A CURRENT ORDER....before you guys who are waiting on a 9mm start emailing me.....the one who this is for will be contacted tomorrow with a tracking number.












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Joined: September 6th, 2006, 3:27 am

November 1st, 2011, 6:08 pm #2

this gun is very light for it's size. Weighs only 2 lb 4 oz without scope.

The barrel bands are nickle plated alluminum. The stainless barrel is very thin walled.


Well, back to the shop, I have two more of these to duplicate.
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Joined: April 28th, 2010, 12:23 am

November 1st, 2011, 6:21 pm #3

very cool, when first reading i thought it was a rifle , thats serious power for a pistol.i wonder what could be done with a full length disco 9mm???
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Joined: September 17th, 2011, 9:10 am

November 1st, 2011, 9:08 pm #4

The most powerful gun I have ever built.

Barrel is 14" with a 13" stainless air tube.

The valve was located 1/2" farther from the end then the normal Crosman location, so the hammer stroke is a full 1/2" longer.

The Disco valve was highly modified in pretty much every way possible.

The spring is .041 and 1 1/2 longer then the stock Discovery spring.
Has a Don Cothran rear cocking kit, with my own custom hammer.
The frame is phase 3 with an adaptation of the PPG phase 2 drop sear system.

The port seal is 5/16 poly.Surprised me with this power, as I had been using 3/8 poly tube for big bores....but the thin wall of this 9mm barrel prevented it's use.

I credit most of the huge power to the hammer / spring system, it really opens that valve and keeps it open more than long enough.
I think this gun could use a lot higher starting fill pressure, but I am limited to a hand pump...........scuba tank some day !

Shot string with 77.8 grain eugin and 3200 psi fill is :
Shot 1. 685 =81 FPE
shot 2. 630 =68 FPE
shot 3. 597 =61 FPE
shot 4. 465 =37 FPE


YES, THIS IS FOR TO FILL A CURRENT ORDER....before you guys who are waiting on a 9mm start emailing me.....the one who this is for will be contacted tomorrow with a tracking number.












Sweet pistol, i've to say!

Wish it was mine. .
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Joined: September 6th, 2006, 3:27 am

November 1st, 2011, 10:55 pm #5

very cool, when first reading i thought it was a rifle , thats serious power for a pistol.i wonder what could be done with a full length disco 9mm???
Just one I had on the shelf.

It does waste some air, so a longer barrel would definetly take the power up.
I think there are some who have gotten over 150 FPE in .32 cal rifles built on the Disco platform.
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Joined: November 5th, 2003, 8:29 pm

November 2nd, 2011, 3:28 am #6

The most powerful gun I have ever built.

Barrel is 14" with a 13" stainless air tube.

The valve was located 1/2" farther from the end then the normal Crosman location, so the hammer stroke is a full 1/2" longer.

The Disco valve was highly modified in pretty much every way possible.

The spring is .041 and 1 1/2 longer then the stock Discovery spring.
Has a Don Cothran rear cocking kit, with my own custom hammer.
The frame is phase 3 with an adaptation of the PPG phase 2 drop sear system.

The port seal is 5/16 poly.Surprised me with this power, as I had been using 3/8 poly tube for big bores....but the thin wall of this 9mm barrel prevented it's use.

I credit most of the huge power to the hammer / spring system, it really opens that valve and keeps it open more than long enough.
I think this gun could use a lot higher starting fill pressure, but I am limited to a hand pump...........scuba tank some day !

Shot string with 77.8 grain eugin and 3200 psi fill is :
Shot 1. 685 =81 FPE
shot 2. 630 =68 FPE
shot 3. 597 =61 FPE
shot 4. 465 =37 FPE


YES, THIS IS FOR TO FILL A CURRENT ORDER....before you guys who are waiting on a 9mm start emailing me.....the one who this is for will be contacted tomorrow with a tracking number.

















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Joined: July 20th, 2011, 7:27 pm

November 3rd, 2011, 12:02 pm #7

The most powerful gun I have ever built.

Barrel is 14" with a 13" stainless air tube.

The valve was located 1/2" farther from the end then the normal Crosman location, so the hammer stroke is a full 1/2" longer.

The Disco valve was highly modified in pretty much every way possible.

The spring is .041 and 1 1/2 longer then the stock Discovery spring.
Has a Don Cothran rear cocking kit, with my own custom hammer.
The frame is phase 3 with an adaptation of the PPG phase 2 drop sear system.

The port seal is 5/16 poly.Surprised me with this power, as I had been using 3/8 poly tube for big bores....but the thin wall of this 9mm barrel prevented it's use.

I credit most of the huge power to the hammer / spring system, it really opens that valve and keeps it open more than long enough.
I think this gun could use a lot higher starting fill pressure, but I am limited to a hand pump...........scuba tank some day !

Shot string with 77.8 grain eugin and 3200 psi fill is :
Shot 1. 685 =81 FPE
shot 2. 630 =68 FPE
shot 3. 597 =61 FPE
shot 4. 465 =37 FPE


YES, THIS IS FOR TO FILL A CURRENT ORDER....before you guys who are waiting on a 9mm start emailing me.....the one who this is for will be contacted tomorrow with a tracking number.












Obviously nice work!

After I got mine, I'll keep guys out there informed about the "Big Thing" - for sure!

Let's wait and see, eh?

Wish all of you a nice Day ....

André from Germany / Spain
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Joined: September 23rd, 2002, 6:16 pm

November 3rd, 2011, 6:08 pm #8

Sweet pistol, i've to say!

Wish it was mine. .
when do you expect to have it? Love to hear a review.

Walter....
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Joined: May 31st, 2008, 5:09 pm

November 4th, 2011, 9:20 am #9

The most powerful gun I have ever built.

Barrel is 14" with a 13" stainless air tube.

The valve was located 1/2" farther from the end then the normal Crosman location, so the hammer stroke is a full 1/2" longer.

The Disco valve was highly modified in pretty much every way possible.

The spring is .041 and 1 1/2 longer then the stock Discovery spring.
Has a Don Cothran rear cocking kit, with my own custom hammer.
The frame is phase 3 with an adaptation of the PPG phase 2 drop sear system.

The port seal is 5/16 poly.Surprised me with this power, as I had been using 3/8 poly tube for big bores....but the thin wall of this 9mm barrel prevented it's use.

I credit most of the huge power to the hammer / spring system, it really opens that valve and keeps it open more than long enough.
I think this gun could use a lot higher starting fill pressure, but I am limited to a hand pump...........scuba tank some day !

Shot string with 77.8 grain eugin and 3200 psi fill is :
Shot 1. 685 =81 FPE
shot 2. 630 =68 FPE
shot 3. 597 =61 FPE
shot 4. 465 =37 FPE


YES, THIS IS FOR TO FILL A CURRENT ORDER....before you guys who are waiting on a 9mm start emailing me.....the one who this is for will be contacted tomorrow with a tracking number.












Thanks for showing us how it was done. Looks great and it's cool to the see the potential of that platform!

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Joined: September 17th, 2011, 9:10 am

November 4th, 2011, 11:04 am #10

when do you expect to have it? Love to hear a review.

Walter....
No it's not mine; Walter.

I,ve ordered a Black .25 !

And i suspect 'm soon...
But don't know when i got 'm ?!
Only Darren knows...

But;
Hope to come back soon with finaly GOOD news, ánd a revieu !

Maybe this one is André's, but i'm also not totaly shure of that.

greetingsss...Guido
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