SIG SAUER SIGM400 Rifle - Manual (Page 69)

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CAUTION: THE FIRING PIN MUST BE FULLY INSERTED INTO THE BOLT CARRIER PRIOR TO INSTALLATION OF THE FIRING PIN
RETAINING PIN. THE RETAINING PIN MUST PASS BETWEEN THE LARGE SHOULDER OF THE FIRING PIN AND THE HEAD OF
THE FIRING PIN.
FIG 46 FIRING PIN INSERTED INTO BOLT/CARRIER
4. Re-install the firing pin retaining pin into the bolt carrier from left to right.
5. Point the bolt carrier assembly with the bolt face upward and ensure the firing pin is properly retained in the carrier by
lightly slapping the bolt face back into the carrier (locked position). The firing pin should NOT fall out of the carrier.
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