SIG SAUER SWISS ARMS SG552 - Manual (Page 19)

3.15. Assembly
The weapon must always be assembled in the reverse
order of stripping:
1. Assemble magazine.
2. Install firing pin:
• Insert firing pin and spring into the bolt head.
Ensure that notch is correctly located to accept
retention stud.
• Press firing pin into the bolt head. When the notch
allgns with the stud hole, insert the stud.
3. Install gas tube:
• With its rounded notch facing the barrel, slip the gas
tube through the front sight mount. Its end must
locate in the appropriate seat in the receiver.
• Twist the gas tube against the front sight mount
until the catch stud of the gas valve registers in the
headpiece of the gas tube.
4. Install gas valve:
• With the notch for the catch facing the barrel, insert
the gas valve into the headpiece of the gas tube.
• Press in the catch stud and rotate the gas valve
clockwise to setting.
• Check that gas valve catch has registered.
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Handling
15. Stripping the magazine:
• Use the thick end of the firing pin to press in the
retention lug of the floorplate. Slide out magazine
floorplate to the rear.
• Pull out floorplate catch together with magazine
spring and follower.
Handling
36
illu. 48) Stripping the Magazine illu. 49) SIG Assault Rifle SG 552 Commando stripped
illu. 50) Install firing pin
Correct location of retention stud notch illu. 51) Install gas valve