SIG SAUER SIG516 Rifle - Manual (Page 69)

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2. insert the action spring into the receiver extension tube.
FIG 41 actIon sPrInG and BuFFer
started Into receIver extensIon
3. Push the recoil buffer back into the receiver extension until the buffer retaining plunger engages the face of the buffer
and holds it into the receiver extension.
FIG 42 BuFFer held Into receIver extensIon