SIG SAUER SIG556xi - Manual (Page 56)

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6.1 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 back through the gas block positioning the flange so it fits flush against the gas block.
STeP 2