OK guys, I know one of you can tell me the answer. I have a G33 with "EHRXXX US" I know this is several years old and I just noticed today that it had "US" after the serial number. and it is only on the metal tag on the lower frame, not on the barrel or slide. I don't believe Glock was making guns in the US that many years ago, Can someone tell me what this means? Also my son has a G22 4th Gen that says Patent pending on the lower frame? Could this be a rare model? Thanks, Eli Wanna kill these ads? We can help!