Specna Arms SA-B01 ONE™ M4 AEG Airsoft Rifle – Black

The Specna Arms SA-B01 ONE™ M4 is a beautifully balanced, performance‑oriented electric rifle designed to combine rugged reliability with a clear path for future upgrades. For players stepping up from a starter kit or those who want a daily‑driver airsoft rifle without breaking the bank, the SA‑B01 ONE™ delivers practical performance, smart features, and a level of build quality that punches well above its price tag.

From the moment you pick it up, you’ll notice the thoughtful balance of size, weight, and ergonomics. The classic M4 platform feels familiar in hand, with a responsive grip and smooth controls that make transitioning from other AR‑style systems effortless. Finished in a clean tactical black, this rifle is equally at home in CQB arenas, woodland fields, or milsim scenarios where durability and adaptability are key.

Externally, the SA‑B01 ONE™ features a robust mix of polymer and metal components. The upper and lower receivers are built from reinforced polymer, giving a strong, lightweight backbone, while metal reinforcement points prevent flex and ensure solid attachment for rails, sights, and accessories. The rifle comes standard with a comfortable M‑LOK handguard that provides plenty of real estate for lights, lasers, grips, or other tactical tools, all without adding unnecessary bulk.

Flip‑up iron sights are included right out of the box, saving you from having to invest in additional optics immediately. These sights fold cleanly out of the way when you choose to mount your favorite red dot or magnified scope. Ahead of the handguard, the 14mm counter‑clockwise threaded barrel makes fitting suppressors or tracer units easy—letting you personalise your setup for whatever style of play you prefer.

Underneath the externals lies a classic Version 2 gearbox, widely regarded for its simplicity and ease of maintenance. Specna Arms has integrated its Quick Spring Change system into this gearbox, meaning you can adjust the rifle’s power (FPS) without needing to fully dismantle the internals or take it to a tech. This is a huge advantage if your local site enforces different power limits between indoor and outdoor play. The gearbox itself is built on a solid foundation with steel gears and 8mm bearings designed to keep cycling smooth and reliable during sustained fire.

Accuracy and shot consistency come from the 6.03mm precision inner barrel paired with a rotary hop‑up unit. This combination lets you fine‑tune BB backspin with ease, providing surprising range and tight shot groups—especially considering this model’s accessible price. Whether you are engaging opponents at mid‑range or laying down suppression in tighter spaces, the SA‑B01 ONE™ gives you confidence in where your BBs are going.

The inclusion of an enlarged stock with room for a long‑lasting battery is a detail that seasoned players will appreciate. Inside the adjustable stock, there’s generous space for Li‑Po or NiMH batteries, meaning long game days won’t have you constantly swapping packs. The Tamiya small connector keeps things simple and compatible with a wide range of batteries commonly found in the community.

Handling is intuitive, thanks to an enlarged magazine release, smooth fire selector, and ergonomic pistol grip. You’ll find the controls easy to reach and operate even under stress or when wearing gloves. The rifle ships with a 250‑round S‑MAG Hi‑Cap magazine, ensuring you’ve got plenty of ammo to stay in the fight longer. These magazines are designed with reliable BB feeding in mind, reducing misfeeds or hesitation during rapid fire.

Specna Arms’ ONE™ line embraces a “performance first” philosophy, meaning the SA‑B01 is sturdy enough for regular use yet accessible to new players who want to grow into upgrades over time. It’s a rifle that’s ready to go straight from the box, but it also makes tuning and future enhancements straightforward. Upgrade paths for hop‑up chambers, MOSFETs, batteries, triggers, and internals remain open, giving you the freedom to personalise and refine your build as your skill and expectations evolve.

Crucially, the SA‑B01 ONE™ is a rifle that doesn’t feel underpowered. With a stock setup that provides solid kinetic performance and stability on target, it competes confidently with other rifles in its class. Whether you’re laying down suppressive fire, manoeuvring through objectives, or exploring upgrade possibilities, this rifles aims to satisfy both beginner and intermediate players alike.

In short, the Specna Arms SA‑B01 ONE™ M4 AEG is a dependable, versatile airsoft gun that strikes a great balance between performance, adaptability, and value. With room to grow and enough quality in the box to start playing right away, it’s a compelling option for anyone ready to take their game seriously.

Features

• Reinforced polymer and metal build for strength and agility 
• M‑LOK handguard for wide accessory compatibility
• Included flip‑up iron sights
• Version 2 gearbox with Quick Spring Change system
• Steel gears and 8mm bearings for reliable internals
• 6.03mm precision inner barrel with rotary hop‑up unit
• 14mm CCW threaded barrel for accessories
• Enlarged adjustable stock with room for larger batteries

What you get

• Specna Arms SA‑B01 ONE™ M4 AEG rifle 
• 250‑round S‑MAG Hi‑Cap magazine
• Instruction manual and QC certificate
• Adjustable stock and included flip‑up iron sights

Details

• Battery included: No
• Blow Back: No
• Colour: Black
• Product length: Adjustable (M4 standard)
• Product weight: ~2400g (varies with battery)
• Power supply: Electric (AEG)
• Hop‑Up: Yes, rotary adjustable
• Inner barrel length: Standard M4 length
• Magazine capacity: ~250 rounds
• Quick Spring Change system: Yes
• Type of plug: Small Tamiya