underlug

English

Etymology

From under- +‎ lug.

Noun

underlug (plural underlugs)

1. (firearms) One of the locking lugs on a break-action firearm that extend from the bottom of the barrels under the chamber(s) and connect into the receiver bottom.
2. (firearms) The metal shroud underneath the barrel of a revolver that surrounds and protects the extractor rod.