Abstract: Writing nib assemblies and associated writing instruments are provided herein. Writing instruments are provided including a barrel having a barrel first end and an oppositely disposed barrel second end, an ink reservoir disposed within the barrel and containing an ink composition, a feeder rod disposed within the barrel and in fluid communication with the ink reservoir, a writing nib assembly disposed at least partially within the barrel and in fluid communication with the feeder rod, and a writing nib adapter disposed at least partially within the barrel and at least partially surrounding the writing nib assembly, wherein the writing nib adapter comprises at least one slot extending from an outer surface of the writing nib adapter to the inner surface of the writing nib adapter the slot being configured to allow for the passage of gas therethrough.