Hank,
I love my AF & it has passed all of the liner lock tests w/flying colors; however, my experience does not seem to be universal. You may want to do some searches of the Knife Reviews as well as the old General Discussion forum for additional opinions of this model. As I recall, there were quite a few comments -- many of them negative -- regarding the AF's locking mechanism.
I suspect that Gerber had/has some serious QC issues w/this model -- some function as designed, while some do not. FWIW, this may not be a knife you want to buy online, sight unseen.
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Cheers,
--+Brian+--