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SIGARMS SG 551 News
Page updated: 09 March 2003

tSIG SG 551
SIG Sturmgewehr for SWAT & SOF
"Little Green Sticks of Death"
by Marvin V. Stenhammar

SIG Assault Rifles Now Available for U.S. Law Enforcement

SIGArms of Exeter New Hampshire has announced the return availability of the outstanding SIG SG 551 & SG 552 family of Assault Rifles.  These modern high performance rifles have been unavailable for several years, since the so-called "Assault Weapons Ban". SIG has now reintroduced these venerable rifles, for law enforcement and military use, with some new and updated features. All SG 551 and 552 assault and sniper rifles are based on the SIG SG 550 family of rifles. The same rifles in semi automatic variants are also know as the SIG PE90 in Switzerland.

The SIG SG 550 family has been in use for several years with the Swiss Army. It is also used by dozens of countries, agencies and special operations forces.  The SG 550 series are know for their quality, dependability and accuracy and also have simple and ergonomic operating controls and well designed features that make training, employment and transition very simple.  

Swiss Army Certification

To receive the Swiss Army "Field Grade Certification" is no small feat.  The Swiss military have to function in one of the most rugged environments on earth and the equipment "certified" by the Swiss Army is know for its endurance and dependability, in even very harsh conditions.  SIG's SG 550 Sturmgewehr was put through one of the most rigorous "torture tests" ever conceived.  The so-called "fire & ice" tests included freezing the rifles into a solid block of ice, leaving them outside on a frigid, snow covered mountain in the Swiss Alps, followed by loading and firing several thousand rounds of ammunition.  Then came the ovens and chemical applications for the hot tortures.  This was followed by dust, sand and mud baths, where the rifles were completely submerged into a muddy goop and then put into operation. 

Swiss Army Soldiers

Swiss Army Soldiers

Extensive "troop trials" with live ammunition and sustained "barrel erosion" firing tests were included during development of the rifle and ammunition.  All these trials and tests served to establish the overriding quality of the SIG assault rifles SG 550/551. They also earned the weapon system the simple, yet meaningful qualification issued by the Swiss Army of "field-grade".

Mud Bath
The "Mud Bath" - One of many tortures

Swiss Flag
Swiss Army "Field Grade" Certified

Technical Data & "Field Grade" Certification Documentation is Available - Click Here -

Agency Orders Only

In the United States, these new SIG "Assault Rifles" are for Military and Law Enforcement use only.  With SIG Military & Law Enforcement Sales currently accepting "Agency Orders Only". "Letterhead Sales" will not be authorized for individual officers until the logistics system and importation process is well established and SIG has plenty of guns out of the bonded warehouses and in stock.  Law Enforcement Agencies are asked to contact Bill Vanderpool, SIGArms Director of Military & Law Enforcement Sales, at telephone 1-703-978-0896.  Unlike the SIG HQ & Sales Team in Exeter, New Hampshire, Bill's office is in Burke, Virginia, close to the hot bed of power and all things Federal.

The Guns

Engineered like a fine Swiss watch, but as tuff as a Swiss-made Pinzgauer.  Years of rugged field use with continued development and subtle modifications make the SG 550 family even better today than the originals.  New variants and features abound and SIG has certainly made improvements on what was already an excellent rifle.  The new variants include options for several barrel lengths, from the 10 inch "Commando" to the 26 inch "Sniper System".  SIG has also incorporated the new and improved, all stainless steel op rod and updated gas system.  This is an upgrade that further dampens perceived recoil and increases the already spectacular MTBF rating or "Mean Time Between Failures".  The SG "Select Fire" guns are now available with 3 shot burst and automatic.

New Optics and Rail Accessory System

In lieu of the rear drum sight, the new SIG rifles have an integrated mil spec 1913 Picatinny rail with integral "flip up" front and rear sights.   The RAS allows quick attachment of Reflex and other optics as well as lasers, target designators, and tactical lights.  A new drum type rear sight will be available soon and the SIG rail being mil spec, is compatible with standard A.R.M.S. and Trijicon mounting hardware, as well as various optics and NVD's. 

Model Designations & Features

Sturmgewher SG550-551

 

SIG SG 550/551

The Technology Leader in Modern Assault Rifle Design

Following grueling comparative trials, the Swiss Army selected the SG 550 as its basic weapon platform.

Over 30'000 marksmen in Switzerland alone purchased the model Stgw 90 PE / SIG PE90 and use it as their personal target rifle.

Superior performance in a battle proven cartridge that is available world wide - Caliber 5.56 NATO.

SG 551-1P

Law-Enforcement Carbine in Caliber 5.56 NATO

Powerful, maneuverable and rapidly deployed assault weapon system for special units exposed to sudden confrontations with well-armed or mobile opponents.

Designed specifically for short to medium range engagements. 
Range 0 to to 300 meters.
Single-shot, 3-round burst or fully automatic (with lock).
Folding butt stock.
Simple magazine change (5, 20 or 30-round magazines).
Stackable - Clipable magazines.
Weight of weapon with empty magazine: 3,4 kg. (7.5 pounds)

Granat Werfer
Granat Werfer - Grenade Launcher

SG 551-LB (Long Barrel)

Special version with a longer barrel. (LB)
Single-shot, 3-round burst or fully automatic (with lock).
Highly suitable for grenade launching.


SG 551 SWAT - SOF

SIG SG 551-SWAT
SIG Assault Rifle for SWAT - SOF - Maritime Engagements

Ambidextrous safety.
Selective fire modes: single shot, 3-round burst or full auto with lock.
Folding butt stock.
Ergonomic design.
Simple and rapid magazine change.
Lightweight, transparent, stackable mag for 5, 20 or 30-rounds.
Very low weight factor.
Compact Dimensions.


SG 551 SWAT with Trijicon ACOG - TAC Light - Bi-pod & Laser Lugs

SG 551 SWAT Technical Specifications


SIG SG 552 Commando

SIG SG 552 COMMANDO

Compact High Firepower Weapon for Entry Teams & SOF

Collapsible folding stock.
Positive "Hard Lock" in open and closed position.
Precise, handy, flexible.
Compact weapon for short and medium distances.
Engineered for maritime operations.
Especially corrosion-resistant.
Selective fire modes: single, 3-round burst or full auto with lock.
Semi-automatic version also in available.
Compact and portable.
Only 504 mm long (20 inches) with butt stock folded.

SG 552 Folding Stock
SIG SG 552 "Commando" Less than 20 inches folded

SG 552 Commando Technical Specifications


SIG SG 551-P Sniper

SIG SG 551-P SNIPER

Semi-Automatic Precision Rifle in Caliber 5.56 NATO

The SIG SG 551 Sniper System has universal adjustments to it's butt stock and cheek rest.  An ergonomic, variable rake angle pistol grip, with anti-slip texture.  A scope that is adjustable for eye relief and offset provide optimal target acquisition. It features a solid lock up, detachable folding bi-pod and an ingenious sling.  SIG "Sniper Systems include a hard locking case and a soft "drag bag" case.


SG 551-P "Sniper System"

Developed in close cooperation with SOF & Law Enforcement.
Exceptional accuracy derived from heavy, hammer-forged barrel.
Low-recoil, gas-operated loading system with rotating bolt.

Ambidextrous safety catch ensures high level of readiness to fire.
Impressive firepower with 5, 20 or 30-round magazine capacity. 
Rapid strings of fire through automatic repetition.
Weight of weapon system complete: 7.02 kg. (15 pounds)
The weapon of choice for difficult and demanding missions.
Simple and rapid magazine change.
Magazines with 5, 20 or 30-round capacity.
Ambidextrous safety and controls.
Various accessories like ZF scopes.
Integral Mil Spec 1913 Picatinny - Rail Accessory System (RAS).


SIG Sturmgewehr SG 551 Hard and Soft Cases


SG 551-P Lower Receiver with Adjustable Sniper Stock


SG 551-P Components


Information on the SIG SG 551-P Sniper Rifle

SG 551 LB Technical Specifications

Got Bullets?

SIG's Sturmgewehr detachable magazines come in 5, 20 and 30 round configurations.  

They can be stacked by clipping the attachment points together.  SIG recommends the 3 stack, for tactical employment, which provides 90 rounds of 5.56 NATO ammunition.

The magazines are made of durable polycarbonate materials and are resistant to gun cleaning solvents, most chemicals and ultraviolet light.  

They are very easy to clean and maintain and are see through, with index marks at the 10 and 20 round levels.

SG 550 series rifles include a "paddle" magazine release.  The release and reload system have very positive controls, making mag changes quick and easy. 


Stackable - Transparent Magazines

Handling Characteristics

The SG 550 and SG 551 are not far from perfection as far as their human engineering and ergonomics are concerned.  The selector switch is combined with the manual safety and they are positioned just under the shooter's thumb and are on both sides of the lower receiver.  They can be easily manipulated by the shooter, while maintaining the combat or pistol grip.  The trigger guard is hinged, so it can be moved to the left or right, if the shooter is wearing protective garments or artic gloves.  The cocking handle and bolt lock catch are rubber coated and within easy reach for most shooters.  Lefties will have to turn the rifle just slightly to work the cocking handle, but it is very easy to get trained up on.  They are also advised to use the cocking handle to release the bolt, rather than using the bolt stop catch. 

The SIG SG rifles are well balanced and designed to fit most shooters.  The weapons are light, but also feel solid and substantial.  Effective use of the synthetic material in the stocks and grips reduce the load and increase durability.  They can be easily operated with only one hand and are designed for attachment of cheekpiece in combination with scope sights.  Maintenance and cleaning of these rifles is extremely simple.  The entire weapon can be disassembled and reassembled with without the use of tools.  The complete rifle, with butt folded and with scope or night vision equipment mounted, can be carried - safely and well protected - in its standard hard case.  

SIG By the Numbers

SG is for Sturmgewehr "Strum Gewehr" from the German for "Storm Rifle" or Assault Rifle. The design of the SIG SG 550 was derived from that of the SG540 in1984. The SG 550 incorporates numerous innovations which contribute to its accuracy which is greater than that of the Stgw57 - and which make it an almost perfect weapon from the human engineering point of view. The heavy barrel and the chamber are hammered from a single piece.

SG 550 - SG 551 - SG 552 Technical Specifications



SIG SG 550 Variants

SG 550 21" Barrel
SG 551 16" Barrel
SG 552 10" Barrel
SG 551-P Sniper 26" Barrel

550 Dash 1's and 2's

- 1 following the model number signifies the 1-in-10" twist rate.
- 2 following the model number signifies the 1-in-7" twist rate.
- SP or P or PE signifies that the rifle is a semi-auto version.
- LB signifies "Long Barrel".

Note: The 40mm Grenade Launcher uses the "LB" variant.


SIG SG 550/551 Lay Out

All in the Family

The SIG assault rifles of the SG 550/551 series are a weapon family. A maximum of common components and identical operation between weapons greatly simplifies training and logistics. New design methods and applied weight-saving concepts for both models eliminate the need for tools when field stripping or in the event of major takedowns. Consequently, the weapons can be rapidly stripped, cleaned and assembled for immediate readiness. Component interchangeability reduces downtime to an absolute minimum.

Click Here - for SG 550/551 Component Graphics

Refer to this diagram for parts interchange information.

Technical Data & Specifications


Common Parts are Interchangeable
 
- Click To Enlarge -

Rugged Beauty

Like the Swiss Alps, where these weapons originate, they are both rugged and beautiful. The SG 550/551 series are also extremely durable and very dependable. Designed to limit the ingress of mud, dust, dirt or sand they continue to function even under the worst conditions.  In the case of climactic extremes or hostile environment,  the shooter can manually close the bolt, to prevent further fouling.  The gas adjustable valve has two settings that help to ensure reliable cycling, even under extreme conditions, or with poor ammunition.  

But with all that ruggedness and  reliability also comes a well balanced and aesthetically pleasing weapon and one of the "sweetest" shooting assault rifles ever made.  SIG's excellent trigger design allows good controlled fires, and allows the shooter to do singles and count rounds even in full auto.  An effective muzzle break and flash suppresser, as well as the exceptional operating rod system, keep your rounds right on target, even during sustained or suppressive fire.

I had the privilege to deploy and use these fine rifles on several occasions, while assigned to an army special operations unit. (Back when I was young and skinny.)  They are, in my not so humble opinion, "simply the finest assault rifles in the world".  If asked to "Pick One Gun" I would choose the SIG SG 550 series over any other assault rifles made.  A strong endorsement from a guy who owns 7 AR-15's and loves them all.

If your department has a need for a dependable, accurate, easy to maintain, well made, precision engineered 5.56 rifle system, that is also reasonably priced.  Then you own it to the tax payers of your community and to your fellow officers to give the SIG SG 551/552 serious consideration.  You will find a weapons system that has "Engineered Reliability" for all the hard times "When it Counts". 

Updates and Information

Technical Specification Charts - Click Here

Some graphics of the major components are shown - here -.

For additional articles, graphics and information on the SIG SG 551/552 Assault Rifles see the - Sturmgewehr Philes - below.

 SIG is Schweizerische Industrie Gesellschaft

Some Images & Information Courtesy of:
SAN Swiss Arms AG Neuhausen am Rheinfalls, Switzerland.
SIGARMS Inc. of Exeter, New Hampshire U.S.A.

SIGARMS Contacts
Engineered Reliability - When it Counts

Military / Law Enforcement USA

SIG Arms Inc.
Military & Law Enforcement Sales
Burke, Virginia USA

Tel/Fax 1-703-978-0896

Corporate HQ - Exeter NH USA

SIG Arms Inc.
Corporate Park, Industrial Drive
Exeter,  NH  03833 USA

Phone (603) 772 2302
Fax (603) 772 9082

International Callers Dial 001 for the USA

SIGARMS HQ Switzerland

SIGARMS
Neuhausen am Rheinfalls
CH - 8212, Switzerland
01-053/21 61 11

From the German, SIG is an acronym for: Schweizerische Industrie-Gesellschaft
In English, Swiss Industrial Corporation


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