What is the likely lifespan of the dual-recoil spring set-up in the Glock 29 using the Wolff recoil guide rod? I don't have an exact roundcount, but all of a sudden, my Glock 29 slide is stopping about 1/2" short of battery... ammo is 180 gr. Plated Flat Point ammo pushed to about 1175 fps... pretty warm but not super hot. Pistol has perhaps 750 rounds through it with the Wolff guide rod and dual recoil spring set-up. When I do the recoil spring test (empty pistol pointed upwards, trigger pulled, easing slide toward battery... the slide does NOT close on it's own) so it appears that the recoil spring is weak... is this the likely cause of the FTRTB? How long is this dual-recoil spring set-up in the Glock 29 expected to last using warm to hot loads?