Simply Forensic Reference Library
Breechface Marks
Fingerprints, Firearms & Pattern Evidence
Definition. Impressions or markings formed on a cartridge-case head when it contacts the firearm’s breechface during firing.
How the term is used
Such markings may be examined alongside other cartridge-case features and test-fired comparisons.
Forensic example
A questioned cartridge case is compared with test-fired cases from a recovered pistol.
Interpretation limitation
Toolmark conclusions must account for subclass effects, quality and documented error risk.
References and further reading
NIST OSAC forensic terminology. The explanation and example are original educational summaries; consult the cited material and current laboratory guidance for authoritative application.