The (new) Crosman Forum, your first and last stop for all things Crosman

 photo TW_custom_pc77_r_zpslyddcslm.jpg

Tom West's Custom PC77 PumpMaster Classic Short Rifle

 Return to Index  

Hey, Trev. Fun, isn't it!?

June 14 2012 at 2:40 PM
Phil  (Login Duane30)
Crosman Forum Member
from IP address

Response to 392 carbine progress update

Nice work.

If you ar concerned about the stroke, purchase a Benji HB pistol inlet valve. It is shorter in length AND has much less volume. You would see gains immediatley on 10 pumps. However, you will then need to add some length to the factory piston (slightly less than 1/2"). To do this, (1) you can cut the piston rod then thread both ends (1/4x20 threads) or, (2) heat up the end where the lever link attaches and pull out the piston rod and thread the hole to 1/4x20 thread and the piston rod. You then would need to use a sleeve nut to capture both ends.

As far as the slot. The slot should have needed to be extended the same amount that has been removed from the tube, (edit) that's if you were using factory components. I did not scroll far enough to see the piston unitl later - oops. Put a rod in that piston (make it longer), problem/stroke will be solved.

Survival Benji? Now time to bed liner the stock.

"The majority of things in our lives are created by folks no smarter than the rest. Afterall, the world is comprised, and operated by C average people intellctually, academically, and morally. These people are often the great pioneers that set the precedent for what excellence should be."

This message has been edited by Duane30 from IP address on Jun 14, 2012 2:44 PM

 Respond to this message   

Crosman Corporation 1-800-724-7486
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 soley the opinion of the individual member