Thanks. The spring is tight when compressed, but I do notice it bows a little due to the thin nature of the guide rod vs. the spring, if you get my drift. In other words, the inside diameter of the spring is larger than the outside diameter of the guide rod, so the spring doesn't hug the rod tightly like a 1911. So .... do I just call S&W, give them the S/N, and they will be able to determine if I need one or two recoil springs? And will the gun reliably and safely work with just one? Or should I just go with two recoil springs and ask them to send me both? Thanks again.