[bberkley]

I got into a little bit of heated discussion with Dean Spier over the PPB's Glock 21 problems. That being said, I have one for personal defense, and sometimes use it for USPSA Limited 10, and GSSF matches. Pretty much all the Glocks larger than 9mm have less support at the 6 o'clock position. There are plenty of documented instances where the pistol has gone boom instead of bang, and about all that I have read of have been ammo-related. Either some fool not too attached to his fingers wildcats his reloads, defective factory ammo, or poor quality control in reloads with accidental double charges or not enough crimp leading to bullet setback when it hits the feedramp. Many auto-loading pistols do not have a fully supported chamber, aftermarket barrels have more support, and therefore are recommended if you plan on reloading because it will not stress the brass as much. Excessive cold-working of the brass to remove the "Glock bulge" will lead to premature case failure.