My Beretta 92FS is the only one of my six autos that has never jammed (with about 10k rounds through it) so I guess it qualifies as ultra reliable. That said, it's only one gun and I have heard some negative threads about Beretta's internal component quality. I don't own a Glock. They are supposed to be reliable but I can't stand the trigger pull. You should rent one and shoot it first.