Was at the gun range today, talking to fellow shooter. He was shooting a Ruger Mark III, I shot my Ruger Mark I. He told me that he got his Ruger after Glock sent him a brand new gun (straight across trade) because his .40 cal Glock blew up in his hand. He also had a .357 SIG Glock blow apart. Luckily, no injury. He told me he learned that both of these calibers have or had a small unsupported case area in the chamber, so if you had any ammo with a weak case wall they can blow up the gun. Has anyone else heard about this occurrence? According to my new aquaintance 9mm and .45 Glocks DO NOT have the unsupported case area in the chamber, therefore they don't have any problems of this sort. Anyone had anything like this happen to them?