S&W internal locks

[kt]

bought a new smith 642 the other day, a glock in a polo shirt and a pair of khakis was not cutting it. love carrying this piece i seriously forget its presence. bit much to hang on to with +P's .how ever after buying ordering i started to research on the gun and found a lot of people flipping out about internal locks like they have on the taurus, one guy went as far as to say that it can be possible that the lock can shoot itself into the locked position. any thoughts? its a smith so i figure they are on top of it
kt