Specna Arms SA-C20 CORE™ HAL¹ ETU™ M4/AR-15 Carbine AEG

If you need a classic M4 platform, ready for any situation, then the Specna Arms SA-C20 CORE™ HAL¹ ETU™ M4/AR-15 Carbine AEG is one to keep an eye on. Constructed to Specna's CORE standard, the SA-C20 boasts a CNC aluminium handguard and alloy outer barrel paired with a high-density polymer receiver, buffer tube, stock and pistol grip, giving you a great combination of realism and ease of use. As with the original CORE series, the polymer quality is much more scratch-resistant than comparable metal receivers and ultra-light for high energy throughout the skirmish day.

Inside this, the latest SA-C20 variant, we are treated to the HAL ETU/MOSFET, a lovely addition for no extra cost! The HAL¹ ETU offers binary trigger, AUG mode and sniper delay instead of semi-auto and semi-auto lock, 3-round burst or 5-round burst instead of full auto, along with several quality-of-life improvements and most importantly for CQB, adjustable pre-cocking! Pre-cocking positions the piston at the rear of its cycle after a shot, meaning when you pull the trigger the response is practically instantaneous, ideal for semi-auto duels. 

Starting at the front we find an M4-style Bird Cage flash hider, attached to the outer barrel, which sticks out from the front of the CNC aluminium quad-railed handguard. This gives the SA-C20 a classic military look and replicates the real steel platform perfectly. The outer barrel features the common 14mm CCW male threading, ideal for swapping to a sneaky suppressor or tracer unit. 

The handguard itself is constructed from CNC machined aluminium, guaranteeing a flawless form and precise, in-spec attachment interfaces. A 20mm Picatinny rail is present at the 12 o'clock position, with an MLOK interface present on the sides of the handguard. This platform is ready for both 20mm and MLOK rail-compatible accessories including grips, lasers, flashlights and more!

Next up we reach the receiver, which is of a standard and instantly recognizable as the standard M4/AR-15 configuration with controls laid out in a considerate and ergonomic manner, allowing the SA-C20 to be manipulated quickly and instinctively by veterans, or learned rapidly by new users.

The fire selector lever is situated just above the pistol grip, on the left side of the AEG, providing 3 modes of fire, SAFE, SEMI, and AUTO, with a 90-degree throw between each. The fire modes are helpfully marked in bold recessed text on the receiver and the selector switch locks positively into each mode with the help of texture on its surface to guarantee you have a good grip on this control. The magazine release is on the right side of the magazine well, easily accessible for a right-handed user with the tip of the trigger finger but can also be learned by a lefty using their off-hand thumb.

Pulling back the extended charging handle, at the top rear of the receiver, will open the dust cover and retract the mock bolt carrier, which allows access to the rotary HOP-up adjuster. This is the latest and greatest HOP-up design for the M4/AR-15 AEGs and provides finer increments of adjustment and holds its setting more effectively when compared to the older gear style HOP-up unit. The charging handle has an extended latch for easier access, allowing even gloved users to access the HOP-up unit, though you may need to remove your glove to adjust the unit!

The bolt catch on the left side of the receiver does not function but is nonetheless a separate part mitigating the common tell-tale signs of a replica. The forward assist is a similar story, being present on the right side of the upper receiver and being a separate moving part which can be pressed in but does not affect the function of the AEG. A new addition to this HAL-equipped SA-C20 is the flat trigger, enhancing the aesthetic with a touch of modernity and providing an easily slappable trigger for snappy double taps in semi-auto. 

The pistol grip of the SA-C20 is an M16A2/M4A1 style pistol grip, also known as the "A2" finger ridged grip. The A2 has diamond checkering on either side and linear texture on the back strap to provide excellent gripping qualities no matter the weather or whether you wear gloves or not. The finger ridge is designed to help you keep hold of the rifle and prevent the grip from slipping out of your hands when held in a single hand (if you're going for a Terminator-esque look). As with most M4/AR-15 AEGs, this grip is compatible with aftermarket M4/AR-15 AEG grips, ideal for customisation addicts!

The battery compartment is inside the crane stock, accessible by squeezing the two tabs at the toe of the stock together, after which you can lift the butt plate off, remove the battery plug and make use of the stock's built-in battery compartment to house a chunky nunchuck/crane-style battery. Being equipped with the HAL ETU, we are also treated to a Deans/t-plug battery connector, a lower resistance alternative to the mini-Tamiya found on previous Specna Arms CORE AEGs. For the SA-C20, we recommend a 7.4V 1450mAh LiPo crane/nunchuck battery for an easy fit and great performance.

The Crane stock also includes a pair of QD sling sockets, one on each side, allowing for QD sling swivels to be added for a quick removable sling setup. Conventional sling slots (aka "footman loops") are also present for those who want a two-point sling but prefer the old-fashioned way. The butt plate is also made from grippy rubber, ensuring your SA-C20 doesn't slip off your shoulder at a critical moment. 

Inside the HAL¹ equipped SA-C20, we have an alloy V2 gearbox shell with 18:1 ratio steel gears running on 8mm bushings. The spring guide is an ESA quick change example, making power tuning a breeze for those who want to get as close to site limits as possible. The inner barrel is a 6.03mm tightbore paired with a rotary HOP-up unit, giving you superb accuracy potential and the most up-to-date HOP-up unit style for M4/AR-15 AEGs. All internal parts are Tokyo Marui AEG spec, meaning aftermarket upgrades are a go for the performance seekers!

The HAL¹ adds a whole lot of functionality into the mix, with programmable fire controls, 6 levels of pre-cocking adjustment and 5 levels of trigger sensitivity adjustment. Available fire modes include 3 or 5-round burst, binary trigger, AUG mode aka two-stage trigger, semi-auto only and sniper delay, giving you loads of options for how you use the SA-C20. Features like these are usually only present in high-end replicas; we simply cannot believe the wealth of functionality inside the HAL¹ equipped SA-C20, especially considering the low price point!

If you want a platform that can do it all, then the Specna Arms SA-C20 CORE™ HAL¹ ETU™ M4/AR-15 Carbine AEG is the one for you! This very versatile platform has plenty of rail space and is appropriate for both CQB and outdoor skirmishes. It packs amazing tech inside at a very attractive price point, the SA-C20 is perfect for new players to get started, or pros who are looking for a very high-tech AEG without the usual high price point.

Features

• 6.03mm Tightbore inner barrel - Great accuracy potential
• High-density polymer with CNC Aluminium handguard 
• Bird cage Flash Hider pre-installed
• 14mm CCW Male threaded outer barrel 
• MLOK handguard - Picatinny rail at 12 o'clock MLOK rails at other positions
• Flip-up aperture iron sights pre-installed - Adjustable for windage and elevation, 2 apertures to choose from
• 20mm Picatinny railed receiver - Ready for red dot sights, PEQ lasers or scopes to be mounted
• Rotary adjustable HOP-up unit - The latest M4/AR-15 design, holds its setting well and allows for fine adjustment
• Finger ridged "A2" pistol grip - Comfortable for most hand sizes, textured for extra traction
• Flat mil spec trigger guard - Matches real US Army-issued M4A1 rifles
• 3-Position fire selector switch - SAFE, SEMI AUTO & FULL AUTO, 90-degree throw between each mode
• Extended charging handle - Fast access to the HOP-up unit for quick mid-game adjustment
• 6-Position M4/AR-15 buffer tube - Adjust the stock quickly and easily to suit your body type or loadout
• Crane stock pre-installed - Plenty of battery space, QD sling sockets built-in
• Version 2 Gearbox:
  • Steel 18:1 ratio gearset
  • ESA quick change spring system
  • 8mm bushings
  • ESA quick change spring system
• HAL¹ Programmable MOSFET/ETU functions:
  • Low voltage alarm
  • Active braking 
  • Adjustable pre-cocking (6 levels)
  • Two-stage trigger (AUG mode)
  • Sniper delay
  • Semi-auto only
  • Binary Trigger
  • 3 or 5-round burst
• HAL¹ Programming instructions available here
• Rear wired: Deans battery connector - Recommended battery: 7.4V 1450mAh LiPo in crane/nunchuck config.
• Compatible with M4/AR-15 AEG magazines - S-Mag High-cap | S-Mag Mid-cap | S-Mag Mid-cap 5 Pack

Package Includes

• Specna Arms SA-C20 CORE™ HAL¹ ETU™ M4/AR-15 Carbine AEG
• 380rnd S-Mag M4/AR-15 High-cap magazine
• Cleaning rod