Was curious IF Glock fixed the OP's 23, i had to send back my Gen4 Glock 23 today. I was getting severe brass to the forehead, i shot 3 13rnd mags & 30 hit me in the forehead. I called Glock & told them my issue & they told me they wouldnt send me a pre-paid shipping label lol. UPS wanted almost $80 to overnight it HAHA, i went back to the dealer i bought it from & he sent it for me for free. Mine was made on 09/16/2011 & i bought it new in Feb of 2012 & the number on my recoil spring assembly is 033. I have 450 rounds through my 23.