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Tom West's Custom PC77 PumpMaster Classic Short Rifle

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Can't help you with the o-ring sizes but -

August 1 2012 at 6:45 AM
SteveV  (Login stevevines)
Crosman Forum Member
from IP address

Response to I have searched awhile this am and could not find the answer,

I do have a suggestion for the valve retaining screw. This works very well in conjunction with the HiPac, and I got the idea from a post by airgunsnirvanna here I believe.
Replace the back half of the co2 valve with the back half of a Disco valve. Now by slightly enlarging the valve retention screw hole in the tube, you can use one of the Disco valve retention screws to "pin" the valve. Works like a charm!

hope this helps


This message has been edited by stevevines from IP address on Aug 1, 2012 6:49 AM

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