I have three questions that I am hoping will be answered... First of all, what is the tension on a normal recoil spring that comes in a new G21? Secondly, I am probably going to be changing my original recoil spring so that I can get a stronger one to handle shooting the +P rounds. Which spring should I get, the 20lb, 22lb, or 24lb spring? Finally, with a stronger recoil spring installed, will that affect normal operation of the pistol if I am shooting normal rounds? Will the spring be too strong to let a normal round cycle through the gun? I would appreciate any help..... Thanks.