KPYK SA-PJ13 PRIME Aster ETU BLDC

Specna Arms x KPYK SA-PJ13 PRIME™ Aster ETU BLDC™ Airsoft Carbine – Black

The Specna Arms x KPYK SA-PJ13 PRIME™ Aster ETU BLDC™ is the pinnacle of collaboration-driven engineering, marrying Specna Arms’ airsoft heritage with KPYK’s durability-focused AK-system expertise. This modular carbine is built to dominate on CQB lanes, milsim operations, and open-field skirmishes right out of the box, with a focus on reliability, precision, and future-proof adaptability.

Why this carbine stands out

• Premium construction – a steel-dominated exterior (barrel, breech cover, outer barrel, trigger guard, magazine catch, selector wing, butt sling eye, gas tube, folding stock, and stock) paired with aluminum sighting hardware, a dovetail rail, and a CNC handguard overlay from KPYK for enhanced rigidity and heat resistance. Nano Coating on the body protects against scratches in harsh field conditions.
• Rigorous internal engineering – features a CNC steel gear train (16:1) with an 8mm J-Cage bearing setup, reinforced steel piston, and a steel cylinder for durability under full-auto bursts at high rates of fire.
• Precision hop-up and consistency – Rotating TDC Magnus™ Hop-Up chamber provides highly stable BB stabilization and repeatable adjustments, complemented by the Helium™ Flat Hop Eraser to reduce float and improve accuracy under compressive stress.
• High-performance drive – equipped with Specna Arms DarkMatter™ High Speed 27-35K brushless motor and a built-in GATE Aster electronic system for crisp trigger response and dependable power management.
• Advanced internal features – 6.02mm precision inner barrel, 24mm CCW to CW thread for easy muzzle device swaps, and a Numbered serial barrel for easy tracking and authenticity.
• Ergonomic, modular, field-ready – M-LOK rails and a Picatinny rail enable a wide range of accessories (red dot sights, lasers, grips, torches), while a folding stock and a spacious under-breech battery compartment support quick changes in dynamic environments.

Key specifications and performance details

• Finish & coating – Nano Coating for scratch resistance and long-term durability.
• Drive and electronics – GATE ASTER V3 electronics for efficient power management and reliable firing control.
• Barrel and hop-up – 6.02mm precision inner barrel with Rotating TDC Magnus Hop-Up chamber; Helium Flat Hop Eraser enhances BB flight stability.
• Gearbox and internals – CNC steel gears (16:1), reinforced piston with steel jaw, 8mm bearings, and steel cylinder for robust performance under field conditions.
• Battery and space – generous space under the breech cover for stick-type batteries, simplifying tangle-free cabling and quick swap-outs.
• Stock and rails – folding stock for compact transport; M-LOK and Picatinny rails for versatile accessory mounting.
• Additional springs – includes two extra springs (M90 and M135) for on-the-fly tuning to match field performance and power goals.
• Compatibility – accepts standard airsoft accessories and systems; readily adaptable to a range of field setups.

In practice, this carbine offers exceptional reliability in demanding scenarios—from tight CQB layouts where quick target acquisition matters, to longer-distance field engagements where hop-up consistency and bolt-on accuracy are crucial. It’s designed to perform with minimal tuning out of the box, while offering extensive upgrade paths through its rail system and compatible components.

Explore more from the brand and related gear to complete your loadout:

Specna Arms • airsoft rifles • batteries and chargers

Who is this for?

Ideal for dedicated milsim players, serious CQB enthusiasts, and AR/AK-platform fans who demand a robust, highly tunable platform with top-tier components. If you value a high-performance build that reduces the need for aftermarket tuning while still offering room for personalization, this is a strong upgrade from standard entry-level carbines.

What you should know before you buy

• The SA-PJ13 PRIME™ Aster ETU BLDC is designed for players who want reliability at speed, with a focus on consistency across a range of field conditions.
• Out-of-the-box performance is strong, but the modular rail system is ready for a wide array of accessories to adapt to different game formats and environments.
• Pair it with appropriate batteries and chargers from our collection to maximize cycling stability and trigger response in live-fire tests.