Does anyone know what an EX1/2 is?

[stencollector]

We have this rifle at the museum where I work. It was issued to us as just another EX1. And while it looks like a regular EX1, it has the nomenclature EX1/2 stamped on the side. Notable is that the serial number is about 9 away from the start of the EX2 series.

For the life of me, I don't understand what an EX1/2 designated. Anybody?

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