Manual

SIG 556 Operators Manual 30 P/N 1511203 VER 12.7.2
• During the rearward motion of the bolt carrier (4), the bolt
head (5) is rotated by the control cam (3) so that the lock
ing lugs (8) are disengaged. The bolt is now unlocked.
• The bolt assembly moves rearward along the receiver rails
(16) as far as the stop (17) with the following taking
place:
o the recoil spring (2) is compressed;
o the hammer (7) is cocked;
o the extractor (18) extracts the case from the
chamber; and
o the ejector (19) ejects the case through the port in
the receiver (16).
4.1.2. Bolt Advance
• The force of the compressed recoil spring (2) pulls the
bolt forward.
• The bolt head (5) feeds the next round from the magazine
(20) into the chamber.
SIG556 OM 12.06.qxp 1/8/2007 2:25 PM Page 30