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1. A pivot pin for a coupling an upper receiver of a firearm to a lower receiver of the firearm, the pivot pin comprising: a head; and a shaft that extends from the head, the shaft defining a detent-retention channel that extends along a first side the shaft, the installation aperture is spaced apart from the channel, the shaft defining an installation aperture opposite the channel from the head and extending through the first side of the shaft, the channel being configured to receive a detent and to enable the pivot pin to slide relative to the detent in the channel between a locked configuration and an unlocked configuration, the installation aperture being configured to receive a tool that extends through the shaft and to enable the detent to be urged by the tool into a detent recess in the lower receiver while the shaft covers the detent recess in the lower receiver and while the tool extends through the shaft, whereby the installation aperture in the shaft facilitates reducing a likelihood that the detent escapes from the detent recess in the lower receiver during installation of the pivot pin in the lower receiver.
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