SIG SAUER SIG516 Rifle - Manual (Page 81)

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11.0 lubrication
using lubricant designed for use on firearms, lightly apply to the contact areas of the following components:
upper Receiver assembly
• forward assist.
• ejection port cover spring and latch.
• charging handle latch and spring.
• front sight detent.
• rear sight windage screw and detent.
• gas valve body and threads.
• Pushrod and spring.