4 bolt advance – SIG SAUER SIG 551-A1 Rifle User Manual
Page 50
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
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