Was reading in another forum that it is pretty much a real PITA to keep night sights clean on a C model. Basically, it was stated that if you shoot the gun with any regularity, the sights will become so dirty that they become useless. Anyone have any thoughts on this? And yes I am aware that a "C" model glock will give me 3rd degree burns over 90% of my body, and permanently blind myself and anyone else within 150 yards of me, if I ever was to use it in a defensive situation. But I'm just curious about fouling the sights.