SIG SAUER SIG516 Rifle - Manual (Page 23)

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2.1.4. Quad Rail hand guard
The quad rail hand guard protects the barrel and the gas system from damage and provides protection from barrel heat.
The integrated M1913 accessory rails provide attachment points for various devices , such as lights, lasers, sights, and
bi-pods. The quad rail hand guard has unique attachment features that enhances the rifle overall structural integrity.
FIG 4 Quad raIl assemBly on rIFle