No comment on the moon shot thing, but...
The advantage with a Gyrojet in space is that your shooter does not need to fire a second shot 180 degrees opposite to remain in position.
Since mass resistance to motion remains the same regardless of gravity, I see no advantage in the moon's 1/6th gravity.
In fact, the biggest problem in zero-G would probably be spinning rather than gross movement.
This is getting too esoterical. Scan in a pic of the spring, with a ruler for scale, and post it. Given the G-Jet's manufacture, it might even be an off-the-shelf part someone could recognize!
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