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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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Modding tube bulk for power how to... Photo intensive.

November 24 2005 at 11:14 PM

Biohazardman  (Login Biohazardman)
Moderator
from IP address 24.20.146.219

Have been asked about this many times will put it on my site soon but for now.

How to mod tube bulk for power.

The Tube bulk cap Brian and Associates as well as others sell this as part of a two piece tube bulk powerlet eliminator.



Drill 1/4 inch hole all the way trough the cap.



drill 25/64ths hole about 1/4 inch into the rear portion of the cap.



Cut two or three treads from the cap.



Drill out extra material from the front of the cap for more charge volume.



Cap from the rear



Cap from the front



Now combine this modded cap with the mods already available for the valve body ie; porting, stem mods and a lighter spring for some decent power upgrades. If you choose to use the stock Crosman tubes at high pressures such as 1200 to 1500psi be sure to pressure test them with the valve and cap installed. The valve and cap should be secured for safety. Just because some of us have used these mods at the mentioned pressure does NOT mean all of the tubes are safe at these prssures.

Don't blow yerself up be safe know what you are doing or just plain don't do it.




I used to have a life. But now I have the forum. I am a sick man?



    
This message has been edited by Biohazardman from IP address 24.20.146.219 on Jan 15, 2006 7:03 PM


 
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