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Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



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9mm Discovery based valve gives over 80 foot pounds

November 1 2011 at 12:05 PM
darren  (Login dt45acp)
Crosman Forum Member
from IP address 71.34.71.163

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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