Single vs. Double Action Auto Knives.

[Pitmaster]

I've seen a few references to single and double action regarding auto knives. I have no clue what this means, pros-cons, or why someone would prefer one or the other. Does this apply only to OTF or other types. Is it similar to single-double action pistols or revolvers?

 

[Pitmaster]

I just noticed I posted in the wrong forum. Copied to "The Cutting Edge"