Pilot Custom 74 Ballpoint Refill?

[FinalEleven]

So I very recently imported a Pilot Custom 74 giftset...It came with a Pilot Custom 74 fountain pen and a Pilot Custom 74 ballpoint pen.

 

I didn't find the included ballpoint refill amazing so I was wondering if there is any other refill out there that I can use over the included BRNF-30 refill? I would prefer liquid Ink or Gel Refills but if there isn't any option I don't really mind.

 

Here is a picture of the refill along with 3 other refills and the pen itself.

Sorry about the low quality picture, I only have a cellphone camera to use.

 

http://puu.sh/j25Sr/e0ad06ce83.jpg