You 'might' ask this in the NCOWS forum - they'll be more than happy to tell you.
But 1899 is right, and you 'can' use double-actions in double action.
You have to do your own documentation that the piece was in use during the time frame, should you find (or have) something unusual, though - that falls on the individual.
Good Luck!
You'll enjoy the experience.
Scouts Out!