Don’t know if the OP has a Cold Steel AD10 in his collection but if you like the 4Max, the AD10 is just a smaller version and easier to carry. Get it in the tanto version, can’t imagine a stronger folder than that.
I’ve also really enjoyed the all stainless steel Spydercos. Overbuilt, heavy, locks up like a bank vault. Go for the stainless steel Endura
In 1990, the original Spyderco Endura blazed a trail as the first lightweight clip-carry folder. Since then, it has earned an enviable reputation as one of the most popular and enduring folding knife designs ever produced. Now in its fourth generation, it ...
www.spyderco.com