I remember both of those series, I had a bunch of the "Destroyer" books too (they eventually adapted them into the movie "Remo Williams: The Adventure Begins"), as well as stuff like Nick Carter: Killmaster (a way-cool ripoff of James Bond), the Death Merchant, the Specialist, etc., etc.
Yeah I remember Nick Carter and The Death Merchant...must of missed out on the Specialist as I don't recall that one....anyway I remember my mother finding a stack of these books in my room and being so outraged that she burned them....she was obviously concerned about how her little boy was being corrupted ....of course there may have been one of two x-rated sex novels in there as well..