SIG SAUER SIG556xi - Manual (Page 45)

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to eXtRact and eJect a chambeRed caRtRidge
When the rifle is fired, the same gas pressure which drives the bullet forward also acts through the cartridge case to push the
bolt to the rear. That action causes extraction and ejection of the fired case. But, when the bolt is operated by hand, there can
be a failure to extract the cartridge from the chamber, or a failure to eject the cartridge clear of the rifle. These failures usually
are the result of the bolt not being pulled rearward vigorously, coupled with an accumulation of firing residue in the chamber.
from the foregoing it is clear that the gun user must:
1. always visually check the chamber after opening the bolt to eject a chambered cartridge. if the bolt is not vigorously
retracted when being operated by hand, the extracted cartridge can be “ejected” into the magazine area instead of outside
the rifle. (remember that the magazine should be removed prior to unloading the chamber.)
2. Thoroughly clean the chamber and the extractor as often as necessary to prevent accumulation of grease and dirt.
3. if an empty magazine is in the rifle when the bolt is being hand retracted to extract a cartridge, the cartridge may drop on
top of the magazine. Then, when the bolt goes forward, the cartridge will be chambered again! always remove the magazine
before clearing the chamber, and visually ensure that no cartridges remain in the rifle.