When I bought my G23 (used) several years ago, first thing I did was swap out all springs so I could start fresh with it (not knowing the previous owner's round count, etc). At the time, I put in a Lone Wolf stainless guide rod which came with a flat spring. Recently, I ordered all new springs from Wolff Gunsprings and decided to try their guide rod/recoil spring set-up. Unlike LW's flat spring, Wolff uses a regular coil spring. Is there any particular advantage to the flat spring vs the coil spring design? I seem to recall the Glock OEM captive spring was the flat type. FWIW, the gun feels much stiffer with the new coil spring (factory weight), but I'm guessing that's because my old flat spring had lost power after a few years, and now I'm back to OEM spec?