SIG SAUER SIG516 Rifle - Manual (Page 77)

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4. install the four (4) rail screws using a 5/32” hex wrench. Tighten the screws to 60 inch pounds (7 newton meters).
FIG 51 tIGhtenInG oF raIl sectIon screws
5. Tighten the clamp screws to 70 inch pounds (8 newton meters) using a 1/8” torque wrench.
6. repeat step 5 one time.
FIG 52 tIGhtenInG oF raIl clamP screws