The Ensso ARIA is the upgraded BIC ballpoint barrel you have been searching for.
ARIA is machined from solid bars of space-grade (6061-T6511) aluminum and natural brass. The lightweight aluminum version is anodized in matte black for an understated and elegant aesthetic. The brass edition is heavier and offers a more tactile experience. The brass is left uncoated and will develop a patina over time. Such patina is appreciated by collectors but can easily be removed with any brass-cleaning product for a new and shiny appearance.
ARIA is available on Kickstarter for $29 (50% discount off future retail price). My thanks to ENSSO for sponsoring The Pen Addict this week.