2260 with short crosman receiver atop a mini riser made from aluminum tube. Barrel is a 2200 soda straw
tensioned inside a titanium golf club shaft. Three screw mod to the trigger, bulk co2, SSP 250 rear cocking
striker assembly. Factory stock, reshaped, bedliner finish and stick on cheek piece. The idea was a weather
resistant light hunter for rainy days.
I've got a Cothran stainless receiver and gas tube waiting for me to get back to this one.
Mark (Login Specman) Crosman Forum Member from IP address 188.8.131.52
OK stock XT in .22 was shooting 8.2-8.5ft/lbs pre mod
Fitted a .177 barrel, port and barrel standard mods kept valve standard and I was getting 8.29ft/ps 596ft/psec with crosman 10.g
Fitted a lighter valve spring to the mix power drop to 7.52ft/lbs
Getting leaks through the barrel after around 12 shots, swapped out valve stem and modded and shaped new one power still 7.52ft/lbs
Fitted standard hammer spring (to fix leak) and fitted lighter valve spring power dropped to 5.14 - 5.71ft/lbs 548-578ft/per sec.
Oh man...What's happening!!! Co2 leaking again through the barrel after about 20 shots, breech blow back from faulty probe.
Groved my hammer to prevent sear drag, fitted standard valve stem and standard spring but heavier hammer spring. fixed/replaced probe. Velocity is now down to 5.7ft/lbs 578ft/per sec but the valve completely empties with one shot (when I turn off the CO2, which is good right?)
So its back to the drawing board. I'm opening up the valve but its apparent that spring balance is critical in the AS. I'm going back to the standard hammer spring and lightening the standard valve spring.
Any thoughts as to why my velocity is dropping consistently shot on shot? Is it temperature?
The AS is a lot harder to get right than the 2250b
This message has been edited by Specman from IP address 184.108.40.206 on Sep 26, 2011 2:07 PM
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