SIG SAUER SIG 551-A1 Rifle - 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
12SIG541_SIG551_A1MiniManual_Rev1.indd 50 2/17/12 2:48 PM