SIG SAUER SWISS ARMS SG552 - Manual (Page 7)

SG 552 LB
3) long barrel version with diopter sight.
SG 552 LB
4) long barrel version with picatinny rail
with flip up front and rear sight.
The rifle SG 552 can be used:
• at distances of up to 300 m,
in semi automatic fire
in rapid semi automatic fire
in three-round bursts
in full auto operation
• at distances of up to 400 m,
when fitted with telescopic sights
• with the bayonet attached, as a club
and as a blank weapon (on SG 552 LB only).
The SG 552 can be fired with the stock in
the normal position or folded.
2.1.2. Barrel with receiver and gas system
The barrel is screwed into the receiver. The muzzle is
equipped with screwed on or integrated flash suppressor.
The front sight mount, which is fixed to the barrel, con-
tains the gas port, accepts the front sight and gas system
and also serves as a support for the handguard.
The receiver guides the bolt and houses the locking
system. The rear sight mount with diopter drum or
integrated picatinny rail with flip up rear sight are also
mounted on top of the receiver.
Weapon theory
12 13
Weapon theory
illu. 3) SG 552 LB with diopter sight
illu. 4) SG 552 LB with picatinny rail
illu. 5) Barrel with receiver and gas system
1 Flash suppressor
2 Gas valve
3 Barrel
4 Front sight
5 Gas piston
6 Gas tube
7 Bolt carrier
8 Rear sight mount
9 Diopter drum
10 Recoil spring
11 Recoil spring guide
12 Receiver casing
13 Front sight mount
1 3 2 4 5 6 7 8
12 13
9 10 11