i just aquired this knife on 04/26/08 and scott is right, ive never had any lock failure (havent had it long enough to have any lock failure) but i just dont like the lock, to be honest it was at an auction and had i looked at it before the auction i probably would have not bought it not knowing anything about the 531 but when it was held up it looked like a 110 (i was 40 feet away) and since it was a buck i knew if it was damaged it would be repaired by buck (didnt know at that time it had been on a grinder) if need be and i actualy got it for less than 1/2 what a new 110 would cost me and the rest is history
it now has a place in my gun cabinet where it will most likely stay for many years to come unless buck can put a new blade in it with the sawby lock (after being schooled by you guys as to its history i would rather have it with the sawby lock as it is than to have it changed to the other style lock) and then it will still stay in my gun cabinet among my other guns and knives i took a likeing to and gave them a home
not that i have much of a collection, a couple viet-nam knives and a few other knives not of much value but just knives i like
chickentrax, as you would notice on a buck 110 and the 531 without a sawby lock the "spring" on the back of the knife when half opened sticks out a little from the handle allowing the blade to open, on the sawby the "spring" doesnt move at all, the blade actualy "drops out the back thus "unlocking" the blade when you push down on the very back of the blade just behind the edge allowing the blade to unhinge (the blade "drops" out approx. 1/16") and therefore close