How do I unlock the red gun?

Question

In Antichamber, I have managed to access a room adjacent to the room with the red gun. There seems to be a locked door with a mechanism with green lasers and a shape made with yellow blocks.

I cannot manage to block the laser or remove the yellow blocks with my blue gun, which is the the only weapon I have so far. Am I stuck because this puzzle is unsolvable without unlocking another colored gun first or should I try harder?

Answer 1

You need to get the green gun first, then the yellow, then red.