The ball bearing detent on the liner will actually prevent the liner from ever reaching the other side of the knife, though it's a very convincing visual illusion to the contrary.
Concerned about this myself, I took a short flathead screwdriver and tried to pry the liner all the way to the other side, to put it inbetween the tang and the scale, to no avail.
Despite this, there has been at least on person who said, if I recall, that the liner does get stuck on the other side sometimes on his M16 (perhaps the ball itself has fallen out\worn down, which happens occasionally on liner locks). Fortunately, the result is a very difficult time getting the liner to the correct side of the knife again (to unlock), but the blade was held in place nonetheless.
Nonetheless, for most of us, including my pry-tested M16, the ball bearing makes this a practical impossibility.