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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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Sounds like you need to spin the seal

March 16 2011 at 11:56 PM

CO222  (Login CO222)
Crosman Forum Member
from IP address 199.27.130.186


Response to 1377c - Was Leaking Down, now it isn't(sort of), does this make sense?!?!?

Acetal is a hard seal material so it's not forgiving of eccentricity. Nothing's to say
that either the valve seat or seal are perfectly concentric. It's common practice to
apply some lapping paste and spin the seal on the seat (e.g. with drill).
To make your own lapping paste, scrape some of that 1200 grit off with a blade and mix
with cutting oil or other.

 
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