Not specifically, but have you thought about buying a pen you like with a standard size refill, then putting a 0.3mm gel in it?
ie something like: https://www.cultpens.com/i/q/OH43610/ohto-pg-105np-needlepoint-gel-refill
(I realise it's 0.2mm but you get the idea)
Awesome, I didn't know there is a standard for refills. I'm after a good subtle pen that fits these refills then.
@bibimbap started
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Not specifically, but have you thought about buying a pen you like with a standard size refill, then putting a 0.3mm gel in it?
ie something like: https://www.cultpens.com/i/q/OH43610/ohto-pg-105np-needlepoint-gel-refill
(I realise it's 0.2mm but you get the idea)