recoil springs

[Cappi]

forgive my ignorance, but I'm ASSuming there is a recommended round count that recoil springs should be changed

if so, at what intervals?
also, are they different intervals for the 37, 38 and 39?

Thanks


..L.T.A.

[j-glock22]

general rule of thumb is to do "the test" and feel how "loose" the guide rod may be. Many will advise a c/o every 15k-30k, yet some claim 50k+ before changeout. Rods are cheap; keep an extra one handy just in case you do need it.