King Arms Full Metal Sig 556 Holo Aeg Airsoft Rifle

Real Steel History

The SIG 556 is a member of the SIG 550 family manufactured by Swiss Arms AG (formerly SIG Arms AG) of Switzerland. The original 550 was adult equally a replacement for the Stgw 57 (SIG 510) battle rifle. I of the requirements for the replacement was for the rifle was to be modular as the weapon family unit was to include several variants of the base design, including a carbine with a shorter barrel (SIG 551), A commando version with a shorter handguard and an even shorter barrel (SIG 552) and even sniper versions.

The SIG 556 is the commercialised variant of the 551 carbine, designed specifically for the American market. I matter that was different on the 556 compared to the other 550 models was the lower receiver, which has been designed to accept standard M16 magazines. Other changes include an M4 telescoping buttstock, and Picatinny rails and simpler front and rear flip upward sights. All other parts of the SIG 556 are compatibly modular with the rest of the SIG 550 family.

Airsoft Variant'southward

Until recently the on SIG 556 option for an airsoft AEG, was to purchase and install a conversion kit for a SG 552. All that recently changed when King Arms released a licensed replica of the SIGARMS 556 rifle.

King Arms SIG 556 HOLO Full Metal Blowback AEG

On the initial launch King Arms released two versions of the SIG 556, which were:

SIG 556 HOLO.
SIG 556 HOLO DE (Dark Earth Color).

So what's in the box?

Previously when we have received models from Rex Artillery we have not had take chances to see the final packaged box. In this case we take been lucky plenty to receive a retail box.

As with previous AEG's we have received from Kings Arms, inside the box the AEG has been packed in foam.

The box contents include the SIG 556 AEG, Magazine and instruction manual every bit y'all would wait. Additionally King Artillery take supplied parts to permit you to disable the blowback on the AEG and a speed loader.

Initial Impressions

Like other King Arms AEG's we have reviewed, the SIG556 has a full metal receiver, this gives the gun a overnice feel and weight.

Immediately you can run into similarities to M4/M16 AEG'southward Yet on closer inspection information technology is apparent while some things like the sliding stock and magazine catch, the receiver and handguard are quite different.

The specifications of the SIG556 are:

Full Metal receiver with nylon fiber handguard.
7mm Begetting Gear Box.
Special designed Bolt Carrier Operating Mechanism which tin be remove subsequently modification.
330fps
135 Rds Mag Included
Weight: ii.85kg
Length: 86-94cm

Receiver

Equally already mentioned the receiver full metallic synthetic from aluminum, with an anodized matt blackness finish on that looks amazing. We have taken the SIG556 to a couple of skirmishes none of the pigment work rubbed away, where normally nosotros would expect it to when the torso is rubbing against webing.

The receiver includes a scope track running accross the top, and to make the SIG556 holo a lilliputian more authentic King Arms have fully licensed accurate SIGARMS markings on the left paw side under the track.

The magazine catch and fire selector are once again made of metallic, and like the existent 556the lower receiver has been designed to take standard NATO five.56 magazines. This means that standard M4/M16 airsoft magazines should fit.

Butt and Handguard

The outer barrel and flash hider and fake gas cake all accept dark greyness finish. The outer barrel is one slice so there is no chance of any barrel wobble. The nylon fiber handguard is constructed in two pieces. Both the upper and lower half are extremely thick, and will survive any knocks they will get.

The handguard include ii small side runway for attaching torches, lasers etc. On the bottom at that place is too a rail running nigh the entire length of the lower handguard , this should enable you to use a vertical grip and possibly a RIS fitting M203.

The handguard lower half holds the bombardment, and volition except a standard viii.4v mini battery. Unfortunately a ix.6v battery volition non fit, even so it would be fairly piece of cake to alter the lower handguard to enable you lot to fit one.

Access to the battery is washed by removing the front pin pin on the receiver. The pin is a little tight at first however this does loosen after a while, yet its remains tight enough that this will not fall out during a skirmish.

Sights

Both the front end an rear sights are flip up, the front sights are adjustable for windage while the rear are adjustable for elevation.

While the sights are functional most people are going to opt for fitting either a scope or other grade of optics.

Blowback

I of the features we have not mentioned so far is the inclusion of a blowback mechanism. We have already encounter this feature on the Galil we reviewed. When enabled the blowback moves the charging handle dorsum and forth.

The blowback works past positioning the blowback mechanism on top of the gearbox. The mechanism is mechanically connected to the top of the piston, via a modified V3 gearbox, therefore it is the backwards and forwards movement on the piston in operation which cycles the commodities.

This is one of these features you volition either love or detest, I personally dearest it. You do feel the blowback in your shoulder, and the sound coming from the AEG is fantastic. Withal nosotros can come across the downside in that information technology does requite your position away. Thankfully for those who hate this feature It can easily exist disabled, and King Artillery provide instructions on how to exercise this, these are like shooting fish in a barrel to follow and information technology does not take very long.

Stock and Magazine

We have already mentioned that the SIG556 comes with a sliding stock. Made out of the nylon cobweb with the end having a removable safe butt pad on it, the stock has 6 positions. Unfortunately like well-nigh sliding stocks, there is a bit of wobble. This tin can be easily stock-still, the solution we have used in the past is to pad out the stock pipe with electrical tape. However as this is a standard fit you tin can always fit another stock.

Male monarch Arms have chosen to include a 135 circular replica of the SIG polymer mag. The magazine includes the SIGARMS trades. As already mentioned the real SIG556 was designed to user standard M16 magazines, and the airsoft version is no different. We have heard reports of some magazines being tight however we have not had this problem with either Tokyo Marui or Classic Ground forces magazines that we tested ths with.

Gearbox Inner Barrel and Hop

As already mentioned Inside the AEG, Male monarch Arms have fitted a version 3 gearbox. This is like to the gearbox as used on the Galil however it does have a longer air nozzle. The gar box includes steel gears 7mm bearing brushes, ventilated piston caput, brass cylinder, plastic cylinder head. The motor is unbranded and is accessed via the plat in the lesser of the pistol grip.

As already mentioned the SIG556 uses M4/M16 magazines, King Arms have therefore chosen to fit the AEG with a standard M4 metal hop unit. As the HOP unit of measurement sits too far forward King Artillery accept fitted a plastic spacer between the gearbox and Hop unit.

Fitted to the Hop unit of measurement is a standard diameter brass inner barrel that is over 420mm in size, that over 57 mm more a standard M4 carbine.

Functioning

1 expanse that surprised us was the FPS of this AEG, we tested this on the Madbull chronograph that Madbull Airsoft kindly donated to united states. Initial results were 338-342 FPS.

In one case we got the Hop set for optimal range the FPS lowered a little to 329 fps. Next we tested the rate of burn down on a viii.4v battery and got a very respectable 820 rpm.

Once nosotros had fed through a few hundred rounds range was better than my M4 carbine, and at 20 meters we were achieving groupings less than 10 cm's apart.

Skirmishing with the AEG was a joy, the rifle was solid and. We forgot to take a sling with on the day nosotros tested information technology, and the AEG was dropped once or twice. All we had to practice was wipe the dirt away. When checked later on there were no marks on this what and so ever.

What was funny was looking a peoples reactions, many people were looking confused trying to work out what burglarize this was before being told what it really was. It certainly attracted a lot of attending. We promise to exam this over a few more than skirmishes to come across how this continues to perform, and will update this review with further information.

Conclusion

This is a fantastic AEG, performance was spot on, and its a unique AEG on the skirmish field. The large advantage of utilising standard parts similar Magazines, Stock, and Hop unit. And the version 3 gearbox tin can take nigh upgrades that are available.

If you still desire even more than RIS space, Male monarch Arms now supply a aluminum RAS / handguard which should fulfil all of your needs. Or alternatively King Arms supply a model with this already fitted.

Another new model King Artillery have released is the SIG556 shortly which is ideal for CQB. All the models have the blowback feature, which comes with the instructions and parts to disable this.