SIG SAUER SIG556 - Manual (Page 72)

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7.1 Reassembly
The rifle should always be reassembled in the reverse order of disassembly:
1. Install the firing pin:
a. Insert the firing pin and firing spring into the bolt head. The spring should be at the rear. Ensure that the notch on
the firing pin is aligned with the firing pin stud.
b. With one hand, place the bolt head (firing pin at the bottom) on a flat surface and depress the firing pin until the
notch in the firing pin is aligned with the hole in the bolt shaft for the firing pin stud.
c. With the other hand, insert the firing pin stud and release tension on the firing pin. Ensure the firing pin stud is
centered.
2. Install the gas tube:
a. Slide the gas tube (notch down) through the gas block and insert into the gas tube opening in the receiver.
b. Press the gas tube against the gas block (compressing the stop pin) and rotate the gas tube to the right beyond
ninety degrees (90°) until the stop pin locks into the gas tube notch.
3. Install the operating rod assembly:
a. Insert the operating rod assembly into the gas tube. Ensure the end with the charging handle notch enters first,
notch facing down.
b. Push the operating rod in until fully seated. The operating rod should move freely through the gas tube.
12SIG599_SIG556MiniManual1511980Rev02.indd 72 9/12/12 12:40 PM