SIG SAUER SIG556xi - Manual (Page 59)

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6. assemble the bolt head and bolt carrier:
a. Place the bolt carrier in your hand, upside down, cam to the front.
b. With the notch facing up, slide the bolt head shaft fully into the bolt carrier.
c. rotate the bolt head to the left until the notch rests in the cam.
d. Press forward on the firing pin until the bolt head is fully forward.
7. install the bolt assembly into the receiver:
a. Hold the receiver muzzle down.
b. Holding the bolt carrier, align the left lug on the bolt head with the lug channel in the receiver.
c. ease the bolt assembly forward until the left and right receiver rails are riding in the rail channels on the bolt carrier.
d. release the bolt carrier — it should drop freely into the receiver until the bolt is fully locked.
e. The charging handle can be installed on the left side or the right side of the bolt carrier. depress the charging handle
catch and insert the charging handle into the slot on the bolt carrier.
f. release the charging handle catch. Tug on the charging handle to ensure it is secured by the charging handle catch.
g. Verify correct installation by pulling the bolt to the rear — it should be connected to the operating rod and move under
the tension of the recoil spring.