SIG SAUER SIG556 - Manual (Page 74)

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8. 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. 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.
9. Connect trigger casing assembly to receiver assembly:
a. Mate the receiver and trigger casing together at the front takedown pin, ensuring the pivot pin holes overlap.
b. Install the pivot pin from the right side and secure the pivot pin screw.
c. Rotate the trigger casing until the rear takedown pin holes in the trigger casing assembly and receiver are aligned.
d. Press the rear takedown pin in fully
10. Perform a function check in accordance with Section 7.2.
12SIG599_SIG556MiniManual1511980Rev02.indd 74 9/12/12 12:40 PM