My 1990 Glock 21 came with the Polimer 2 sights. The $70+ for a set of steel sights were not available then. The only change I made was to go from a 6.9 to a 7.3 rear sight. I got a complete set of Polimer 2 sights for $11 + $5 shipping [$16]. It's a choice. If the front sight "falls off" I may change over partually to steel.