All SpeedSafes save for the Chive and Whisper are indeed liner locks.
It should be noted that the lock on my Blackout isn't very impressive, but given what my knife is, that's maybe a good thing.
I always considered my Blackout a "soft" use knife due to it's 440A blade and flimsy-feeling (i'm sure they are stronger than they feel) polymide handles. Anyway, one day I dropped it on a tile floor, no damage was done to the blade, thank goodness, but the lock gave, it didn't break, it just unlocked...
My Blackout still performs the same as it did the day I bought it, but this incident really showed me that I could have no illusions of my Blackout acting like an Emerson.