If your friend chooses the Axis lock and is thinking of a g10 Griptilian, have him instead look at the Ritter/Hogue RSK. It’s way more robust, the Able lock (their axis-type lock) is made with more durable springs, etc. Also, I’ve had pivot back out issues with all of my BM knives and play development with most of them (vertical and horizontal), while my Ritter/Hogue is as stable as the day I bought it.