SIG SAUER P556 - Manual (Page 45)

P556 Pistol Operators Manual
45
1511582 VER 08.01.08
4. Install the gas valve:
a. Ensure the stop pin recesses on the back of the gas valve tab
face the barrel.
b. Insert the gas valve into the gas tube (the gas valve will seat
over the operating rod).
c. Depress the stop pin and rotate the gas valve to the right to
Position 1.
d. Release the stop pin. Check to ensure the gas valve indexes in
Positions 1 and 2.
5. Install the upper hand guard:
a. Insert the front into the gas block.
b. Push the rear downward until seated.
6. Install the lower hand guard:
a. Press the hand guard upward against the upper hand guard,
ensuring the locking tabs are aligned with each other.
b. Press the lower hand guard forward until the front is secured by
the gas block and the pivot pin notch is aligned.
7. 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.