Sign in or 
Share this
SG 550
Model: SIG SG 550The SG 550 series is an excellent assault rifle design from the reputable Swiss company Swiss Arms AG, or SIG. The SG 550 series focuses on modularity, light weight, and excellent accuracy. The rifle has been in production since 1986 and was formally by the military in 1990. Since then, many different variations have been seen. The 5.6mm GP 90 round was developed for the rifle, and is interchangeable with 5.56mm NATO. It uses a gas-operated rotating bolt with a short stroke piston, making it very similar to an AK. Magazines are all proprietary and are made of transparent plastic.
Along with the standard SG 550 assault rifle, there's the 551 carbine, 552 Commando carbine, 553 (more reliable modification of the 552), 550 Sniper with high quality components and a long barrel, and various sporting configurations. The American commercial market introduced the SIG556, which can accept STANAG magazines and be modified with an M4-style buttstock. The SIG522LR is a .22LR semi-automatic rifle that accepts standard AR-15 .22 conversion magazines.
| Specifications: | |
| Weight: | SG 550: 4.1kg (9.04lb) SG 551: 3.40kg (7.5 lb) SG 552 Commando: 3.2kg (7.1 lb) SG 553: 3.2kg (7.1 lb) SG 550 Sniper: 7.02kg (15.5 lb) |
| Length: | SG 550 (stock extended): 998mm (39.3 in) SG 550 (stock folded): 772mm (30.4 in) SG 551 (stock extended): 833mm (32.8 in) SG 551 (stock folded): 607mm (23.9 in) SG 552 Commando (stock extended): 730mm (28.7 in) SG 552 Commando (stock folded): 504mm (19.8 in) SG 553 (stock extended): 730mm (28.7 in) SG 553 (stock folded): 501mm (19.7 in) SG 550 Sniper (stock extended): 1,130mm (44.5 in) SG 550 Sniper (stock folded): 905mm (35.6 in) |
| Barrel Length: | SG 550: 528mm (20.8 in) SG 551: 363mm (14.3 in) SG 552 Commando: 226mm (8.9 in) SG 553: 227mm (8.9 in) SG 550 Sniper: 650mm (25.6 in) |
| Cartridge: | 5.6mm Gw Pat 90 5.56x45mm NATO .223 Remington |
| Action: | Gas-operated, rotating bolt |
| Muzzle Velocity: | SG 550: 911m/s (2,989 ft/s) SG 551: 850m/s (2,788.7 ft/s) SG 552 Commando: 725m/s (2,378.6 ft/s) SG 550 Sniper: 940m/s (3,084.0 ft/s) |
| Effective Range: | 440 yd (400 m). |
| Feed System: | Detachable box magazine. 5, 20, 30 |
| Sights: | Hooded front post with folding night post, rotating diopter rear. |
Where to find
Along with military use in many countries, including Switzerland and Brazil, the SG556 commercial rifle can be found in many reputable gun stores for $750-$1500, about equal and sometimes cheaper than an AR-15.
Complexity
The SG 550 series has a good reputation around the world as a very reliable gas-operated weapon. A number of proponents tout its reliability over the AR-15. One problem is that variants other than the 556 and 522LR take proprietary magazines that can be harder to find than AK or STANAG magazines.
Controls
List all controls in a bullet point format, with their location and how to manipulate them; what does what, basically. Example below.
- Safety: Located on both sides of the receiver behind the trigger; push up for SAFE, down for FIRE.
- Magazine release: Located in front of the trigger guard.
- Bolt catch lever: Located above the trigger group on the left side; press in to close the bolt.
- Charging handle: Located on the right side of the upper receiver.
Loading
Condition One, or "Locked and Cocked." Chamber loaded, magazine full, hammer cocked and safety applied.
- Point the weapon in a safe direction. Critical step in case it accidentally discharges!
- Push the safety up to activate it.
- Take a loaded magazine and push it up into the magazine well until it clicks. Tug slightly on it to ensure that it is seated.
- Pull the charging handle all the way back and release it.
- Cannot be done.
Condition Three. Chamber empty, magazine full, hammer down, safety off.
- Point the weapon in a safe direction. Critical step in case it accidentally discharges!
- Take a loaded magazine and push it up into the magazine well until it clicks. Tug slightly on it to ensure that it is seated.
Unloading
How to unload the firearm and make safe. Presented in a numbered list.
- Point the weapon in a safe direction. Critical step in case it accidentally discharges!
- Push the safety up to activate it.
- Push the magazine release forward and pull the magazine from the magazine well.
- Pull the charging handle all the way back and examine the chamber for any ammunition.
- Press the bolt catch lever to close the bolt.
- Deactivate the safety.
- Pull the trigger.
Field Stripping
How to disassemble the firearm for cleaning. Presented in a numbered list.
- Point the weapon in a safe direction. Critical step in case it accidentally discharges!
- Unload the weapon as described above.
- Pull the rear takedown pin behind the safety on the right side all the way out. It will not come out of the gun.
- Unscrew the pivot pin screw on the left side of the gun in front of the magazine well and remove the pivot pin.
- Pull the trigger casing from the receiver.
- Push in the charging handle catch behind the charging handle and remove it.
- Use the charging handle to push the bolt carrier assembly to the rear of the receiver and pull it out. Turn the bolt head counter-clockwise and remove it.
- Pull the lower handguard down and back to remove it. Pull the upper handguard up at the rear and off the gas block.
- Press the stop pin on the front of the gas block in and hold it down. Rotate the gas valve to the left (looking from the front of the rifle) and pull it forward to remove.
- Push the operating rod assembly forward out of the gas tube.
- Press the stop pin again and rotate the gas tube 90 degrees to the left until the gas tube notch faces the barrel. Remove the gas tube.
- Press the rear of the bolt head against a flat surface and hold it down. Using a small punch, nail, or pencil remove the firing pin stud and SLOWLY raise the bolt head until tension on the firing pin spring is released. Remove the firing pin and spring.
chitoryu12 |
Latest page update: made by chitoryu12
, Feb 28 2011, 7:08 PM EST
(about this update
About This Update
Edited by chitoryu12
862 words added 174 words deleted 1 image added view changes - complete history) |
|
More Info: links to this page
|
There are no threads for this page.
Be the first to start a new thread.
