SIG SAUER SIGM400 Rifle - Manual (Page 71)

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9.5. Rejoining Upper and Lower Receivers
To aid in steps 1-3, manually cock the hammer by pushing it down until it is held in place then rotate the fire control
selector to SAFE.
1. Position the upper and lower receivers to align the pivot pin (front pin) holes.
2. Push the pivot pin from right to left until the head of the pivot pin is flush against the receiver. You will feel it captured
by the detent pin.
3. Close the receivers together and push the takedown pin (rear pin) from right to left until the head of the takedown pin
is flush against the receiver. You will feel it captured by the detent pin as you did the pivot pin.
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