STOP PIN, use the search function man. There is a thread in general right now on page two that touches upon your question. Not to mention numerous other threads from the recent past that discuss the tri-ad lock.
We should be nice to people who ask questions, even if they are not the first person to ever ask it.
Mr. Flash, the stop pin takes the force from the blade instead of having it x-fer directly to the lock. Additionally, it is said to be self-adjusting as it wears. And there is widespread agreement that it is exceedingly strong. Here's Cold Steel's explanation: link.
The lock relies on compressive strength instead of tensile strength. A regular lockback pulls on the locktab, where the Tri Ad lock squeezes it. It's pretty much a Compression Lock that moves the locking tab on a different axis.
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