-The shooter should always consider the weapon as loaded and
ready to fire until he has personally convinced himself of the
contrary by unloading it.
-Use only commercial grade ammunition.
-Use only ammunition that corresponds to the caliber of the
weapon.
-During all manipulations point the weapon in a safe direction.
- Never aim the weapon at any object you do not intend to shoot at.
-Do not load the weapon until immediately before use.
-Do not place your finger on the trigger until the target has been
sighted.
-Unload weapon immediately after shooting is finished.
-Detach bolt and magazine from the weapon prior to transportation.
- Keep weapon and ammunition separately and under lock and key.
-Never leave the weapon unattended and keep it out of the reach of
children.
3
2. WEAPON THEORY
2.1 Weapon description
2.1.1 General
The semiautomatic SIG SG 550/551 SP is a gas operated weapon with
rotary bolt mechanism. The operation and maintenance of the standard
version SIG SG 550 and the short version SIG SG 551 are identical.
SIG SG 550 SP
Standard version with folding butt, bipod and carrying sling
SIG assault rifle SG 551
Short version with folding butt.
4
2.1.2 Barrel with receiver and gas system
The barrel is screwed into the receiver. The muzzle is fitted with a
flash suppressor. The front sight mount, which is fixed to the barrel,
contains 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 is also mounted on top of
the receiver.
Barrel with upper receiver and gas system
1. Flash suppressor
2. Barrel
3. Gas valve
4. Front sight
5. Gas piston
6. Recoil spring
7. Gas tube
8. Rear sight mount
9. Diopter drum
10.Receiver casing
11.Front sight mount
12.Bayonet lug (on SG 550 only)
5
2.1.3. Bolt
The bolt consists of two main parts:
-bolt head
-bolt carrier
a. Bolt head
The bolt head locks the bolt assembly, houses the firing pin and the
extractor and feeds the cartridge to the chamber.
Bolt head
1. Control cam
2. Bolt head
3. Firing pin
4. Firing pin spring
5. Firing pin retaining stud
6. Locking lug
7. Extractor
6
b. Bolt carrier
The bolt carrier guides the bolt head, controls the locking and
unlocking by means of the cam, connects the bolt to the gas system
and cocks the hammer.
Bolt carrier from left
1. Bolt carrier 2. Cam
Bolt carrier from right
1. Cocking lug
2. Bolt carrier
3. Bolt handle catch
4. Bolt handle
7
2.1.4. Handguard and bipod
The handguard protects the barrel and the gas system from damage
and provides heat protection. The bipod on the SIG SG 550 can be
used to support the rifle when firing.
Hand guard with bipod
1. Handguard, upper part
2. Handguard, lower part
3. Bipod
8
2.1.5. Trigger assembly and butt
The trigger assembly comprises all the parts required for siring a shot.
The safety lever on both sides can be set to two positions.
Position “S”
Position “1”
By pivoting the trigger guard to the right or left side, the trigger
becomes accessible for shooting with mittens. For safety reasons the
trigger guard must not be shifted until just before firing the weapon,
and after firing it should be immediately replaced in the normal
position.
The folding butt is made of high strength synthetic material.
In the firing position it is held by the butt locking mechanism, and
when folded it’s held by spring pressure on the handguard.
The weapon is locked in the safe position.
The weapon will fire semi auto.
9
Trigger assembly and butt from right
1. Butt
2. Safety lever
3. Trigger casing
4. Magazine catch
5. Trigger
6. Pistol grip
Trigger assembly and butt from left
1. Trigger casing
2. Bolt catch
3. Safety lever
4. Butt
5. Butt catch
6. Pistol grip
7. Trigger guard
8. Magazine catch
10
2.1.6 Sights mechanism
The sights mechanism comprises the rear sight and foresight.
The rear sight is
made up of the:
Rear sight mount
Diopter drum
Windage correction screw
Elevation correction screw
The diopter drum can be set to positions “1”, “2”, “3”, and “4”,
corresponding to firing ranges 100 m, 200 m, 300 m, and 400 m.
The positions marked in white correspond to aiming point =
point of impact.
The red “3” position corresponds to aiming point “black 6” at 300 m.
Sighting position “1” is designed for immediate firing, and two
luminous dots are fitted laterally for aiming at night.
The foresight with tunnel is fixed to its mount with the foresight screw.
A folding foresight is provided for use at with the night sights on the
diopter drum.
11
Rear sight assembly
1. Receiver casing
2. Rear sight mount
3. Elevation correction screw
4. Rear sight drum
5. Night sight
6. Windage correction screw
Front sight
1. Front sight tunnel
2. Front sight
3. Night front sight
4. Front sight screw
12
2.1.7. Magazine
The magazine is transparent and has a capacity of twenty or thirty
rounds. On either side of the casing there is a mechanism, that allows
several magazines to be connected if required.
Magazine, dismantled
1. Feeder
2. Magazine spring
3. Magazine floorplate catch
4. Magazine floorplate
5. Magazine coupling lugs
6. Magazine casing
13
2.2. Technical specifications
SG 550 SG 551
Dimensions inches
Caliber
inches
.223 .223
Total length inches 39.29 34.53
Length with butt folded inches 30.39 25.63
Barrel
Barrel length
inches 20.78
16.02
(USA)
14.3 (others)
Number of grooves 6 6
Rifling:
SG550-1/ SG551-1 right inches 10 10
SG550-2/ SG551-2 right inches 7 7
Sights
Type Diopter sights
Sight base mm 21.26 18.34
Range adjustment m 100 to 400
yards 110 to 440
Weight
Weapon incl. empty
lb 9.03 7.49
magazine
Empty 20 rd. magazine
Empty 30 rd. magazine
Loaded 20 rd. magazine
Loaded 30 rd. magazine
oz 3.35
oz 3.87
oz 11.99
oz 16.75
3.35
3.87
11.99
16.75
Subject to change without notice
14
2.3. Accessories
Every SIG assault rifle SG 500/551has the following accessories:
Carrying sling
Loading aid
Cleaning kit
Carrying sling in woven nylon with two hooks, an adjustment clip and a
buckle
Loading tool
15
Cleaning kit
1. Weapon grease tube
2. Cleaning rod handle
3. Grease brush
4. Barrel brush
5. Cleaning rod sections
6. Extension rod with ferrule
7. Cleaning jag
8. Cleaning brush
9. Simileather case
10. Gas tube brush
11. Chamber cleaning tool
12. Barrel inspection mirror
16
3. Handling
3.1 Important instructions
Before manipulation the weapon, make sure that it is safe and
that the trigger guard is put in the vertical position.
Use only commercial grade ammunition.
Use only ammunition that corresponds to the caliber of the
weapon.
During all manipulations point the weapon in a safe direction.
Do not place your finger on the trigger until the target has
been sighted.
Do not load the weapon until immediately before use.
Unload weapon immediately after shooting is finished.
Detach bolt and magazine from the weapon prior to
transportation.
17
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