SIG SAUER SWISS ARMS SG552 - Manual (Page 18)

11. Press down the gas valve catch. Simultaneously
twist and pull the gas valve to extract it.
12. Press down the gas valve catch. Rotate gas valve
through 90° so that the headpiece notch faces the
barrel.
13. Pull out the gas tube.
14. Remove firing pin:
• Hold the bolt against a firm surface so that the
firing pin is completely pressed into the bolt head.
• Use the awl of a pocket knife to remove the retention
stud. Extract the firing pin complete with spring.
35
Handling
8. Twist bolt head out bolt carrier.
9. Pull lower handguard to rear and lift off.
10. Lift rear of upper handguard and extract it
from front sight mount.
Handling
34
illu. 43) Remove bolt head (rotate)
illu. 47) Remove firing pin illu. 44) Extract bolt head (pull) illu. 45) Lift off lower handguard illu. 46) Remove gas valve