Specna arms SA-C06 CORE™ M4 Rifle in Black

Specna Arms SA‑C06 CORE™ M4 Rifle (Black)

The Specna Arms SA‑C06 CORE™ M4 is a quality-packed airsoft rifle that punches above its price, built for both newcomers and seasoned players looking for high performance without breaking the bank. It’s part of Specna’s CORE™ line—where solid material choices, smart engineering like the ESA™ quick‑spring‑change system, and solid internals combine to create a reliable rifle you can actually take seriously on the field.

Let's talk feel and construction. The receiver, stock slide, and adjustable SF-style stock (which cleverly hides your battery) are made from nylon-reinforced polymer—light, but tougher than your average plastic, thanks to fibreglass reinforcement. That means you get a lightweight rifle—just about 2.2 kg—that doesn't feel tinny or fragile. It's built to handle the knocks from crawling, sliding, and gear piled in the back of a car.

Metal components include the barrel, RIS handguard, mock silencer, sling swivels, enlarged charging handle, and various screws and pins—bringing a reassuring mix of durability and gangster-goodness that stands up to real field use. The RIS handguard even comes with full-length 22 mm Picatinny rails on top, plus shorter rails on all four sides—so mounting scopes, lasers, grips, or lights is a breeze.

One of the CORE™ series standout features is the ESA™ quick-spring-change system. No need to crack open the gearbox or visit a tech—a couple of screws and sliding off the stock reveals the spring, letting you pop in a different power spring in moments. You get two springs right out of the box: the factory-installed ~380 FPS spring, and a spare M90 ~310 FPS option, great for CQB setups and site compliance.

Speaking of internals, this ride’s got a full-metal Version 2 gearbox with 8 mm slide bearings, shimmed steel gears, a polycarbonate piston with a steel tooth strip, type‑O cylinder, steel circuit breaker, and an adjustable rotary hop-up chamber that pairs nicely with the precision tight-bore barrel. Reviews confirm it performs reliably straight out the box, whether with the standard spring or bumped up to M140 levels.

Out in the field, expect a responsive trigger and solid rate of fire using both 7.4 V and 11.1 V LiPo batteries. Admittedly, high-voltage can heat things up and trip the locking mechanism briefly—but for general play, twice-a-week use, this rifle’s performance is smooth. Plenty of owners confirm it’s held up for years with minimal fuss.

The adjustable SF stock doesn’t just look sleek—it actually works, letting you extend the length of pull between 750–840 mm to suit different player sizes or gear setups. One minor gripe from users: the plastic buffer tube can feel a bit wobbly, which some fixed with a bit of tape. But overall, the build quality is appreciated for its balance and solidity.

Front and rear flip-up metal sights are included, folding easily out of the way when adding optics. And that barrel is threaded 14 mm CCW—so you’re free to swap on a real silencer mock-up or tracer unit if that’s your thing.

Out of the box, it comes with a hi-cap 300‑round magazine, fixed iron sights, an iron sight post, plus the spare spring and manual—but no battery or charger, so be sure to grab one from the site’s battery guide.

Highlights

• Nylon-reinforced polymer receiver and stock – light yet tough
• Full metal barrel, handguard, silencer, charging handle, and sling mounts
• ESA™ quick spring change system with included ~380 FPS and M90 (~310 FPS) springs
• Version 2 full-metal gearbox with 8 mm bearings, steel gears, polycarb piston
• Adjustable rotary hop-up paired with precision tight-bore barrel
• Metal flip-up front and rear iron sights
• 14 mm CCW threaded barrel for accessories
• Adjustable stock tailors LOP 750–840 mm

What's Included

• Specna Arms SA‑C06 CORE™ M4 rifle (Black)
• Hi-capacity magazine
• Fixed flip-up iron sights
• Additional M90 main spring
• Instruction manual

Technical Specifications

• Length: 750–840 mm (stock adjusted)
• Weight: ~2.2 kg
• Inner Barrel: 320 mm tight-bore
• Velocity: ~380 FPS (0.20 g BB), ~310 FPS with M90 spring
• Material: Zinc/aluminium alloy, steel, nylon-reinforced polymer
• Gearbox: Full-metal V2, 8 mm bearings, steel gears
• Battery: LiPo/LiFe compatible (not included)
• Thread: 14 mm CCW