SIG SAUER SIG556 - Manual (Page 50)

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4.1.4 Bolt advance
The force of the compressed recoil spring (2) thrusts the bolt forward. The bolt head (5) feeds the next round from the
magazine (20) into the chamber.
In the final stage of the advance, the bolt head (5) locks up and the release bar (6) is depressed. The weapon is ready to
be fired.
illUS. 64) Bolt aDVanCe illUS. 64a) Bolt loCK
12SIG599_SIG556MiniManual1511980Rev02.indd 50 9/12/12 12:40 PM