My newish large 21 has some stick, kind of bugs me, some days i don't care but other days i do. I'm a complete knife disassembly geek too, break down knives constantly and am very good at it, I've tried everything in the book but the stick still stays. Pretty annoying considering some have zero stick, it's all about those slight angle geometry's where the lock face and tang meet, some cause it to bite and wedge in a bit more than others.