Assertion: trigger | /r/MadeOf | lever
Facets:
value: usually
type: DEGREE
Source sentences:
text: Although triggers usually consist of a lever actuated by the index finger, some such as the M2 Browning machine gun or the Iron Horse TOR (thumb operated receiver) use a thumb-actuated design, and others like the Springfield Armory M6 Scout use a "squeeze-bar trigger" similar to the ticklers on medieval European crossbows.