Went to Glock HQ today. Have not been there since 1990, so they have moved down the road. They are in the middle of a huge expansion, building 3 new buildings. Took 5 Glocks for GNS (15 year warranty). 4 were new. The fifth, a G30 OD of indeterminate age, they did all new springs, new RSA and 2 new magazines. Could not have been nicer, took only 40 minutes from checkin to checkout. Talked to 2 armorers there, they said the "issues" on Gen 4 are way overblown, they have seen not that many pistols come in for work. There were 5 other customers there, 4 with Gen4's no one having any issues. Two with Gen4 G21's which are awesome!