Assertion: gun's barrel | /r/HasProperty | changed
Facets:
value: quickly
type: MANNER
value: every hour
type: TEMPORAL
Source sentences:
text: Each gun came with a spare barrel that could be quickly changed when the barrel became hot during sustained fire, though later guns featured a chrome-lined barrel, which reduced the need for a spare.
text: The gun was fired in 250-round solid bursts, and the worn out barrels were changed every hour and a half.
text: A spare barrel is issued with each M240B, and barrels can be changed quickly as the weapon has a fixed head space.
text: Its 21-inch (54-centimetre) barrel can be changed quickly, permitting sustained fire at a maximum effective range of 3,900 feet (1,200 m).