Anyone have any info on Glock's suggestions on how often to change recoil spring on a 44 ? Seems to me that a weak spring could lead to slide damage . I am knocking on 4,000 rds. in my 44 and just thought of this as I was reading about some's cracked slides . Thanks for any info P.S. Also seems to me that a weak spring could lead to locking block damage as well .