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 photo 63f5b325-0274-4312-9dbd-2effde5b3715_zps0x27orls.jpg

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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That little rectangular

September 21 2011 at 12:34 PM

ray1377  (Login ray1377)
Crosman Forum Member
from IP address 72.156.120.35


Response to Re: Wow---how many pumps did you

thing is a check valve.
And in fact, its round and slides up and down inside the valve.
Its held in place by the valve spring which keeps it shut over the little hole in the end of the valve to hold the air in it.
You overcome the springs pressure by pumping the forearm and the piston pushes the air in the little hole.
The other end of the valve spring holds the exhaust valve shut until the hammer hits it and opens the valve to release the air into the exhaust port and out the barrel.
Hope this helps.
Ray
P.S. If it worked before, hopefully cleaning it out and putting it back
together will fix the problem without having to buy a new one.
Besides, the brass valves are the good ones.
The new valves are all aluminum.


    
This message has been edited by ray1377 from IP address 72.156.120.35 on Sep 21, 2011 12:36 PM


 
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