So for about the last 24 months, I've had her on a serious diet. Now I am happy to
report that she lost nearly 13 ounces and is feeling so much better. And let me
say one thing, when I pick her up with one hand now she is light as a feather.
Well, almost a feather.
Things I have done so far:
OEM main tube was lightened by me.
Barrel is OEM and trimmed down by me.
Main tube plug is made of Delrin by me.
Gas cap is aluminum, comes from HPA and bored out by me.
Hammer is made from Delrin by me with a modified 1701P striker.
Valve is an aluminum Disco rear end with a brass Pro-Top by Anthony.
Trigger grip frame is aluminum by Bluefork Design and then hogged out by Gregg.
Front barrel band is aluminum, made by Anthony, drilled by Rich and milled by me.
Mark (Login Specman) Crosman Forum Member from IP address 18.104.22.168
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 22.214.171.124 on Sep 26, 2011 2:07 PM
This forum is not affiliated with the Crosman Corporation in any way// Information presented in this forum is intended for informational purposes only; use at your own risk//Posts made to this forum are solely the opinion of the individual member