First I found out 21lb spring is factory. Purchased 25lb spring from Wolff. Took it to the range and it worked great. There was far less kick with 25lb spring. Only does not compare to having the piston. I took a P7M8 to compare recoil. 150rds and she was luke warm, accurate, no malfunctions, and no problem with spent case ejection.
Yes this was for sale on GB, buyer backed out. Saw the price I was asking, didn't bother reading auction page till after it ended.
Going to repost it, anyone interested???????????