Unsuitable

Lack of marks on a bullet fired through an
inappropriate or low-quality firearm

Courtesy of Jack Dillon

Fired bullets in this category are determined to be unsuitable for comparison.

This outcome is appropriate for fired bullet fragments that do not bear microscopic marks of value for comparison purposes.

These may be

fired bullet fragments,
jacket fragments,
lead bullet cores,
lead fragments,
other portions of fragmented, mutilated, or otherwise damaged bullets
metallic fragments that cannot be identified as having been a part of a fired bullet (often the product of crime scene searches where all small metal items were collected).