Of course, I have no direct knowledge of these items, but I was sitting in my favorite bar one night listening to my friend's wife's maid-of-honor's plumber talking about his brother-in-law's second cousins' best friends' ex-wife's auto mechanic who owned a couple of these...
A double-action is able to be opened manually with your fingernail, and also by the push of a button...a single action only opens with the button...the double action has the notch in the tang; single action had a blind hole in the tang...
If it has an oblong button it is
probably a double action; if it is round,
probably single action...
And a side-opener is like a Buck 110; the blade opens out the side...where some automatics open out the guard and retract the same way...
Definitely store any auto with the tension off the spring...This is a good idea for all knives...
A good quality double action Buck 110 runs about $135 on BB, TKA, or BA...
I could probably find an old pic that my friend's wife's maid-of-honor's plumber talking about his brother-in-law's second cousins' best friends' ex-wife's auto mechanic passed around...if needed...
