underlug

1. 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.[29] 2. The metal shroud underneath the barrel of a revolver that surrounds and protects the extractor rod. The two types of underlugs include half-lug, meaning the shroud doesn't run the entire length ...
Found on http://en.wikipedia.org/wiki/Glossary_of_firearms_terms
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