I had two, one of which I went to town on with the Leupy bits. I don't recall either of them being great. Personnaly I'd move on......or leave alone.
Might be a bit harsh but the words glitter, polish and turd spring to mind.
Steyr Challenge HFT - HW97K - BSA Mercury Challenger - Anschutz 9015 One - AA Pro Target - AA Pro Elite - ASI Paratrooper (R) - Walther LP500
If it's sub 12 keep it standard, Leupey hammers & blodnob valves are great at FAC level but make staying legal difficult.
They also make them harder and rougher to shoot