In the development section it seems I am missing some weapons even if I have the blueprints for them.

For example I have grade 1, 2, 3, 4 and 5 of M2000-NL, but I cannot develop grade 6. The slot is missing. What can I do to develop grade 6?

So the question is: what do I need to develop higher grade weapons?

This is the weapon I would like to research: enter image description here

And these are the levels of my staff units: enter image description here


As you can see, there is no grade 7 M2000-NL. If you follow the line going right through the screen, you'll find the grade 8 version waiting to be developed.

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