My WC 5"" 9mm's came with a flat spring 12# range, 5" 1911 in 45acp came with wound wire in 18.5lbs.
Changed the guide rod to fit a 17" flat coil spring. I also ordered a 13# for 9mm +P ammo and a 15# flatwire
for 185/200 grain target and JHP in 45. I do not have ant hammer springs to goe yo or down with.