I have the adventurer-with-corkscrew. It is my main outdoor/work knife (a bit big for my EDC needs). i've had it for 2 years and had no prroblems at all. the lock is strong enough that i have no problems. It really is a great knife.
I don't know exactly what size my SAK is, but I know it is the bigger one (111mm sounds about right).
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'n Boer maak 'n plan
WOFT