SIG SAUER SIG716 Rifle - Manual (Page 77)

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2. Place the upper rail section over the barrel nut interlocking the tab into the upper receiver pocket.
FIG 49 re-InstallatIon oF uPPer raIl sectIon wIth InterlockInG taB hIGhlIGhted
3. Place the lower rail section over the barrel nut ensuring that the key is seated into the groove of the barrel nut.
FIG 50 re-InstallatIon oF lower raIl sectIon