SigAir MPX Submachine Gun AEG

Bored of SMG-5s and UMPs but want to try a new Airsoft SMG? SigAir have you covered with the awesome new MCX AEG, a modern SMG design derived from the exceptional Sig MCX. The real MPX is well known for being a superb SMG with great handling thanks to its ambidextrous M4/AR15 based controls and also makes use of the ultra slick “new” 1913 rail /20mm Picatinny rail stock attachment system, allowing you to change stocks depending on your role and operating environment. 

The Airsoft version boasts the same slick handling and cutting-edge stock attachment system with a well equipped VFC Avalon gearbox, complete with an active breaking MOSFET to keep the gearbox well timed and preserve the trigger contacts. An impressive tool with some superb CQB potential, let's take a closer look around the MPX and see what's what with this 21st-century SMG.

Starting at the tip of the 8-inch outer barrel we can find a birdcage flash hider attached to 14mm CCW male threading. The flash hider is constructed from alloy with a subtle gun metal grey finish and can be switched out for any 14mm CCW compatible muzzle device, including tracer units, suppressors and alternative flash hiders. 

The handguard of the MPX is constructed from aluminium and is finished with CNC machining, giving it a flawless form with all the details of the original firearm. M-LOK attachment slots can be found at the 3, 6, and 9 o’clock positions, providing plenty of options when it comes to accessorising the MPX without making the handguard uncomfortable to hold when kept simple. Punctuating the M-LOK slots we can see weight-reducing ports which keep the front end of the MPX lightweight and agile, ensuring you can point it quickly and react to sudden threats in a CQB environment. 

At the 12 o’clock position we have a 20mm Picatinny rail which is ready to accept any 20mm Picatinny accessories, including red dot sights and magnifiers. Despite its small size, there is plenty of room up top, and the monolithic top rail allows for a PEQ15, red dot sight and magnifier to be mounted a the same time if you are the type to deck your primary weapon out to the fullest extent. 

The battery compartment of the MPX is located inside the handguard, and can be inserted through the front where you will find a mini-Tamiya battery connector. We found that the MPX can fit a 7.4V 1300mAh LiPo stick battery inside, but will also take a nun-chuck style battery if its cells are nice and flat. Being front wired opens up the possibility of using the MPX with an external PEQ battery box and running a larger battery for those who like to spam the trigger all day without changing batteries. 

The MPX’s receiver is derived from the M4/AR15 configuration and comprises an upper receiver and a lower receiver, just like the AR. The upper is a monolithic design for optimal strength, like the MCX and SCAR, and the lower is patterned after the M4/AR15 but with ambidextrous functionality. 

The fire selector is right where you would expect it; above the pistol grip, sitting right beneath the shooter's thumb for fast access. As with all of the controls on the MPX the fire selector is present on both sides, making this SMG a great choice for a left-handed skirmisher or an experienced skirmisher who likes to be able to shoot from either shoulder to make the most of the surrounding cover. 

The familiarity continues with the magazine release, which is positioned on the magazine well on both sides of the MPX. This is a push button style design and is very similar to an M4/AR15, meaning if you have experience with the M4 platform you will feel right at home with the MPX in your hands. 

The mock bolt release catch is also present on either side; with an M4/AR15 style “ping pong paddle” on the left side, and a push button on the right just above the mag catch. The right side bolt release sits nicely within reach of the trigger finger, which is one of the more enviable aspects of the real MPX design. We wish more M4s had this built in, but for now the MPX will have to do! 

Once again, the charging handle of the MPX is located in the same place as it is on the M4/AR15; at the top rear of the receiver. If this wasn’t a good spot for a charging handle we would suspect Sig of copying Armalite's homework! 

The difference between this and the standard M4 charging handle is its ambidextrous functionality, presenting two release tabs, one on either side which allows you to pull the charging handle with a single finger, whether you are left or right-handed. The charging handle does not need to be pulled to load the first BB, but it is used to lock the alloy mock bolt carrier back to allow for HOP-up adjustment. 

The HOP-up unit of the MPX is located inside the ejection port on the right side of the SMG, and is accessible when the charging handle is pulled back and the mock bolt is locked to the rear. This unit has a rotary style adjuster which is derived from the M4/AR15 rotary HOP-up, which is great news both for those who use their guns as they are and those who like to upgrade. 

Adjusting the HOP-up allows you to tune the MPX for different ammo weights and extend the range of your BBs by applying backspin. With your HOP-up set so your BBs fly as straight as possible, you can release the mock bolt using the bolt catches on either side, and close the dust cover too if you are super tactical!

To assist in speedy reloads the MPX has an extremely wide magazine well flare, practically guaranteeing that you will never fumble a reload. The magwell flare also allows for easy and fast “eyes up” reloads with a bit of practice, making the MPX a great primary for the CQB specialist. On either side of this massive blank canvas of a magwell we can find some lovely engraved SIG trademarks matching the real MPX faithfully; one of the many perks of an officially licensed replica! 

Like the magazine well, the trigger guard is also enlarged to allow for fast access to the trigger, even if you are wearing thick gloves. The pistol grip is a redesigned M4/AR15 AEG style motor grip with a Sig Sauer logo on either side and effective gripping texture on the sides and linear texture on the front and rear. This grip is set at a more vertical angle than most M4/AR15 grips to allow for more comfortable shooting with the stock fully collapsed and with more modern shooting stances.

On either side of the receiver we can see recesses designed for the original sliding MCX/MPX stock system, giving you the option of installing a sliding PDW style stock to the MPX for a different look. 

The stock attachment method of the MPX is known as the “1913 rail stock attachment system”, which basically uses a 20mm Picatinny rail to mount the stock. This gives you a wide variety of aftermarket stock options to choose from, including simple skeletonised stocks for reduced weight, visor stocks for more comfortable use with large full face protection and even M4/AR15 stocks which can be mounted with a 1913/20mm Picatinny buffer tube adapter and buffer tube. 

The stock provided with the MPX is the latest MPX/MCX design and works similarly to the M4/AR15 carbine buffer tube stocks. The stock is adjustable for length of pull, and the high density fibre stock body can be slid along the stock rail to suit any body type and users of large and bulky tactical vests. The stock can be adjusted by pressing the small catch on the bottom of the stock and siding the stock into the desired position where it will lock into place. 

This stock can also be folded to the side for transportation and extreme close range encounters, and all you have to do to achieve this is to brace your thumb on the top of the stock and lift it upwards, after which it can be folded. To redeploy the stock from the folded position, simply pull it out. How is that for slick?!

Built into the body of the stock we can find a QD sling socket on either side, allowing for a QD sling setup to be mounted for those who like to switch weapons in a flash mid skirmish. The stock also sports realistic SIG SAUER trademarks which look great with the other trades on the body and pistol grip. 

On the inside, the MPX has a lot to shout about and uses a standard version 2.1 gearbox with full compatibility with aftermarket upgrades. As it comes the MPX is equipped with a VFC Avalon steel gearset which runs on 8mm bearings for smooth, unlaboured functionality. The MPX has a MOSFET prewired inside the gearbox to protect the trigger contacts, meaning no semi-auto lockup when you are being fast fingered in CQB, and some useful protection for the circuitry which will prolong the life of the AEG considerably.

To make matters all the sweeter, this is the SMG of choice for John Wick, albeit in pistol calibre carbine form, and is also being used by the US Army in the form you see here, and in the subcompact 4.5-inch barrelled variant. An up-and-comer, and potentially a game changer, the MPX from SigAir is the sure choice for a 21st-century submachine gun!

Features

• Full metal construction
• Licensed SigAir product
• John Wick's SMG of choice!
• M-LOK handguard - Ultra modern accessory attachment interface
• 20mm Picatinny receiver rail - Ready for red dot sights/scopes
• 14mm CCW male threaded outer barrel - Tracer/suppressor ready!
• Monolithic upper receiver - Uninterrupted optics rail, very strong design
• Realistic SIG trademarks on the receiver, pistol grip and stock
• 1913/Picatinny stock attachment - Swap your stock in seconds!
• Ambidextrous fire controls - Great for left or right-handed users
• In-line MOSFET pre-installed - Prolongs the life of the trigger contacts
• QD Sling sockets on either side of the stock - Ready for QD sling swivels
• Ambidextrous charging handle - Easy access for left or right-handed users
• Rotary HOP-up unit - The latest M4/AR15 style design
• Front wired - Mini-Tamiya battery connector - Recommended battery
• Ergonomic SIG pistol grip with refined grip angle - More comfortable for modern shooting stances
• Slim adjustable stock design - Easy to carry when folded, very low profile
• Version 2.1 Gearbox - VFC Avalon Steel gearset, 8mm bearings

Package Includes

• SigAir MPX Submachine Gun AEG
• 100rnd Medium Capacity Magazine

Special Instructions 

The barrel base of the MPX is threaded and as such, it may unscrew as you remove your muzzle device. This is normal, and the barrel can be screwed back into place if it does unscrew.