Originally posted by CharlieP:
While munching on the popcorn might as well address the OP.
Is it a bad idea? Probably yes. Why? Because very few owners use it, and those who do use it could (in most cases) just as easily use a padlock device.
It is a bad design? Probably not. Even though there have been reported failures, these reports are rare, and often impossible to verify. I would bet that a significant percentage of reported failures are operator error, e.g., lock not fully open. It is human nature to blame an object or machine for one's own error - be it a gun or a computer. But then, I stongly suspect that some of the failures are fact. But any device will fail, even simple devices like screwdrivers and hammers. And that is the issue some folks have with the lock, its one more thing to go wrong.
But realistically, the failure rate of the lock is so low, even assuming that all reports are valid, that anyone who thinks this is a problem should not even consider using a semi-auto pistol of any kind, since they all probably have failure rates way in excess of the lock failure rate.
Personally, I prefer the no-lock design, but own both types. I have never had a lock fail, and my carry 642 has a lock. No big deal.