WHAT DOES RUGER EC9S MEAN?

I have acquired numerous that have defects, I am more stunned if I get yourself a new gun and it is good than acquiring one particular that isn't as much as snuff. Does not subject whether or not it's Ruger, S&W or Kimber or Other individuals. Poor high quality is now the norm.Inform me, why should I maintain this GP100, return it to Ruger for assi