When I was attending Glock armorer's school, I came to the conclusion that Glock was avoiding the questions we were asking about KB's. I have witnessed several KB's of different degrees. One KB I saw ruptured the chamber, cracking it in two pieces. 6 months after armorer's school I bought a Glock 30; I performed the following modifications:
1 Firedragon fully supported match/ported barrel (eliminates the KB problem and allows you to shoot lead safely)
2 Nowlin all metal buffer system (Firedragon also makes one for the Glock 30)
3 Trijicon front sight and MMC rear... Green front/amber rear
4 New york trigger and extra power striker spring
5 Extra power (+10%) Wolff mag springs for magazines
I have logged an average of 98% daytime and 100% nightime qualification scores with this pistol in 2 years. I was using Cor-bon 230gr. +p and the rounds felt like .38 SPECIALS.
I highly reccomend these modifications to enhance the Glock performance.