SIG SAUER SIG556 - Manual (Page 81)

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SIGHTS
8.0 Sight Options
1. The SIG556 ® rifle is equipped with accessory mounting rails that allow a wide variation of sighting systems to be utilized.
The gas block provides a dovetail mount that allows installation of a fixed front sight (optional on certain models). This
optional front sight can be combined with a fixed type rear sight designed for mounting on the receiver accessory rail.
2. Always follow the manufacturer’s instructions when mounting a sighting system.
3. ALWAYS ensure the rifle is unloaded and clear of ammunition when installing or removing a sighting system or other
accessory.
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