The core series “Captain Action (Moonstone)” has issues #0 thru 4 along with variants, of the Moonstone series, but is notably missing issues #1A and #5 and also has #3.5 listed as #3.
The series “Captain Action Comics” has #1 thru #5, and then has #3.5 (three & a half) listed as #305.
These 2 should me merged into a single series.