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4 bolt advance – SIG SAUER SIG556 User Manual

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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

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9/12/12 12:40 PM