Sorry for lack of detail in first post.
The pen I am looking for is in essence a more durable, refillable version of the uni ball jetstream 101.
I like the pen a lot, as it is also good for maths as well as writing , unlike a fountain pen. However I am annoyed that it is not refillable, and I really just want a pen for life to stop constantly having to buy a new one every 3-4months.
Why not use the penter energel pen instead?. I quite like the ink in the g2
Well, I do use them, but the pens don’t hold up as well as the pilots. The coloring disintegrates and some parts fall off. They also feel low quality with the squeaky plastic.
EDIT: the g-2 refils are also slightly cheaper than the Pentel’s.