Terrible purchase! It's NOT an assisted opener, its HUGE - not for your pocket, weighs a ton, and barely flips open if you wing it full force with your thumb. Now it's going in my bug out bag as a throw away knife for emergencies.
fumaIf you try to use the thumb stud to open it then it won't open, use your trigger finger on the nub that sticks off the back and it flips right open.