SA M4 Keymod (SA-F02 FLEX™) - Black/Tan

M4 Assault Rifle

M4 is a compact automatic rifle developed in the United States based on the popular M16 assault rifle. It was designed to meet the need for a lighter and shorter version of the M16, suitable for use in confined spaces and urban combat.
In the 1960s, the M16, developed by Armalite and adopted by the US Army, served as the basic design for the M4. In the 1980s, the first M4 prototypes appeared, featuring a shorter barrel and a telescopic stock, improving maneuverability in tight spaces.
In the 1990s, the M4 was officially adopted by the US Armed Forces as the standard carbine, replacing older models like the M3 and M9. The rifle features both semi-automatic and fully automatic firing modes, making it a versatile weapon.
The M4 quickly became popular among soldiers due to its lightweight, compactness, and reliability. It has been widely used in conflicts such as the Iraq and Afghanistan wars and has become an iconic weapon of the modern US Armed Forces.
In addition to the standard model, there are many variants of the M4 equipped with different accessories and upgrades to meet the specific needs of military units.
The airsoft AEG M4 assault rifle in the basic FLEX™ series by Specna Arms emphasizes lightweight nylon body while ensuring top-notch construction and fit. The body is reinforced with fiberglass and is more durable than common zinc alloy used in cheap metal bodies, which will be appreciated by not only beginners but also advanced players who prefer fast action in speedsoft style, where every gram counts. This type of body can also be found on weapons like the CZ Scorpion Evo or MP7.
The FLEX series is essentially a sibling to the CORE series, which features CNC metal handguards, while the FLEX series handguard is also made of nylon. The internal parts remain identical to those in the CORE series.

What does the Specna Arms M4 Keymod (SA-F02 FLEX™) offer?

Internal Parts

The M4 Keymod (SA-F02 FLEX™) replica is equipped with classic mechanical contacts, making it safe to use only with 7.4V Li-Pol batteries or you can use classic NiMh cells.
The weapon is equipped with a precision barrel of 6.03 mm and an adjustable Hop-up chamber with a high-quality rubber for excellent range.
Additionally, it features the increasingly common QSC system ESA (quick spring change), allowing you to install a stronger or weaker spring at your discretion. The spring can be changed without removing the gearbox from the gun's body, all done easily through the buffer tube.
The gearbox is also reinforced and capable of working with springs up to M120 (as stated by the manufacturer Specna Arms).

External Parts

The Specna Arms M4 Keymod (SA-F02 FLEX™) replica excels with its high-quality external nylon body, which has a matte finish and provides a very realistic feel. Thanks to the reinforcement with fiberglass, it is also very durable and lightweight.
The outer barrel is made of metal, and screws, ejection port, and pins are even made of steel. The ergonomic design of the AR15 rifles and modern construction ensure a comfortable grip and easy handling, making this rifle fit perfectly in your hands!
The nylon Keymod handguard allows for the attachment of various accessories like a grip, AN/PEQ box, flashlight, etc.
With an adjustable stock Crane type, this replica is ready for various game situations and allows the insertion of batteries (types Buffer Stick, Nunchuck, or Crane).
Overall, this rifle combines low weight and great internal parts with an attractive price.

Plastic parts of the FLEX series body are:

• body
• buffer tube
• handguard
• grip, stock, and sights as in the Edge series

Metal parts:

• outer barrel with 14 mm silencer thread
• flash hider
• charging handle for hop-up access
• screws, pins, and small body parts are even made of steel

Key Features

• High-quality nylon body reinforced with polymer fibers
• Crane type stock for multi-part battery placement
• V2 gearbox with QD ESA quick spring change system
• Reinforced polymer piston with all steel teeth
• Polymer nozzle
• Polymer cylinder head with sealing and metal nozzle tip
• Polymer piston head with sealing
• 8mm metal slide bearings
• Set of gears with a standard ratio of 18:1
• Polymer rotary hop-up chamber
• Precision barrel with a diameter of 6.03 mm

Package Contents:

• Specna Arms AEG Rifle
• Hi-Cap S-MAG magazine for 380 BBs
• Folding sights
• Spare weaker spring (M90) for CQB
• Specna Arms promotional stickers
• User manual

We can resolder the connector to a different one upon request. Simply write the request in the order notes.