Already gave you the part number and price of the Challenger TP in your other thread.It’s a direct replacement but with much smaller hole.
I tried to use the red 17xx TP, the smallest, on my .22 LW MROD-barreled PROD + a Magnum Air Power .038” hammer spring, but it wasn’t as good as I expected.The silver 17xx TP, the medium one, was the right ticket