SIG SAUER SIG556 - Manual (Page 52)

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By pulling the trigger (8) and after having overcome the pressure point, the
sear (4) releases the hammer (3) which strikes the firing pin (9). The sear (4)
falls downwards.
illUS. 66)
StriKing tHe Firing pin
illUS. 67) trigger meCHaniSm
DUring Bolt reCoil
The recoiling bolt presses the hammer (3) down and releases the auto sear (5)
via the release bar (2). The auto sear (5) catches the hammer (3).
During the bolt advance, the bolt presses down the release bar (2). The auto
sear (5) is thereby moved to the rear and releases the hammer (3) to the sear
(4). When the trigger is released, the sear (4) moves to its upper end position.
12SIG599_SIG556MiniManual1511980Rev02.indd 52 9/12/12 12:40 PM