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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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Chronograph results for 2240 valve extension

June 16 2012 at 9:05 AM
zach allen  (Login sonargodz)
Crosman Forum Member
from IP address 68.24.131.244

With stock valve stem, stock weight valve spring, and stock weight hammer spring. Valve has no porting or polishing. The breech is Cothran Machine with hollow bolt. Gun has a 12 inch barrel. Velocity Adjuster was unscrewed all the way, so no extra tension on the spring. Also used one of Anthony's Protops to test the gun with 12 gram cartridges.

Temp 65 degrees using co2 12 gram
14.66 grain Beeman FTS domed
CED Millennium Chronograph

535
529
530
540
533
533
529
530
523
525
525
525
523
520
515
506

I will be testing again tomorrow when it is warmer. I also replaced the stock stem with a polished ground down one. I haven't started porting the valve, and I am over 9 ft/lbs for at least 1 shot.

 
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