I am assembling/making a HPA discovery crosman based on the Don Cothran HPA tube & barns and Assoc Boss valve and front seal fill cap. The whole process was going very well until the final fill cap was to be installed. I Do not want to go into a long story but it seems the fill cap will not go in far enough to engage the o-ring. I am not sure if it is the threads on the tube or the possible out of round threads on the fill cap.
So to any one who has used a Don Cothran HPA tube, Did you go with stock Crosman discovery parts ? if so how did they work ?
Did you have any problems with the Don tube ? I does look very good.... to the eye.
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