I think we have all heard or seen about this clip....so much for the 'safety' of the glock. I think that the bottom line is this: it is the nut behind the trigger that is responsible for safety.
Choose your gun based on your needs, and then PRACTICE, PRACTICE, PRACTICE..................
http://www.youtube.com/watch?v=-PYHR72u51Q
...and then there is this one:
http://www.youtube.com/watch?v=CT0CTbO7L44