KPYK SA-PJ12 PRIME Aster ETU BLDC

Introducing the Specna Arms x KPYK SA-PJ12 PRIME™ Aster ETU BLDC™ airsoft Carbine — a performance-driven collaboration engineered for serious players who demand reliability, precision, and modular versatility straight from the box. Built to dominate on milsim fields and CQB zones alike, this carbine blends Specna Arms’ long-standing accuracy with KPYK’s rugged, purpose-built design ethos.

As part of the PRIME™ J-Series, the SA-PJ12 PRIME™ Aster ETU BLDC™ delivers high build quality, durability, and exceptional performance without the need for post-purchase tuning. The replica features a largely steel construction for critical components — including the barrel, breech chamber cover, outer barrel, trigger guard, magazine catch, selector wing, butt sling eye, gas tube, folding buttstock, and stock — backed by a lightweight aluminum handguard and key sighting components. This combination yields a robust, responsive platform ideal for rapid target acquisition and sustained fire in the most demanding environments. Explore the Specna Arms collection to see more lineage from this trusted brand, or KPYK collection for complementary accessories.

Key features that translate to real-world advantage

• Monolithic reliability with a steel-heavy build in critical areas (barrel, breech cover, outer barrel, trigger guard, magazine catch, selector wing, and more) plus an aluminum handguard with CRC 1U004 gas tube overlay — designed to withstand field wear and aggressive use.
• Advanced Hop-Up system featuring the rotating TDC Magnus Hop-Up chamber for precise, stable accuracy across ranges and sustained engagements.
• Nano Coating finish protects against scratches and scuffs in rugged environments, keeping the finish looking sharp after transport and field use.
• Modular platform with M-LOK mounts and a Picatinny top rail, enabling quick accessory integration for red dot sights, lasers, grips, flashes, and more — perfect for CQB, outdoor skirmishes, and milsim setups.
• Innovative handguard design and a spacious inner layout provide ample room for a stick-type battery under the breech cover, preserving balance and maneuverability in fast-paced games.
• ESA2 quick spring change system enables fast realignment of power and performance without a full teardown, giving you field adaptability for different game formats and rule sets.
• Gate Aster ETU system pairs with the BLDC motor for smooth triggers, fast response, and reliable electronic control during heated engagements.
• High-performance internals include 8mm J-Cage bearings, a CNC steel gear set (16:1), a reinforced steel piston, and a 6.02mm precision inner barrel — all contributing to tighter shot groups and durable cycling under load.
• Powerful propulsion featuring Specna Arms DarkMatter™ High Speed 27–35K brushless motor for rapid cycle times and responsive trigger feel, ideal for aggressive play styles and rapid follow-up shots.
• Two extra springs included (M90 and M135) for easy tuning of back-pressure and velocity to meet local field limits and play styles.
• Operates with a wide range of accessories thanks to the dovetail side rail and integrated Picatinny interface, letting you tailor your setup to your role on the field.

Design and field-ready versatility

The SA-PJ12 PRIME™ Aster ETU BLDC™ is crafted to excel in modern airsoft environments. The folding stock and compact profile make it an excellent choice for CQB houses or indoor arenas, while the long top rail and M-LOK handguard keep it competition-ready for outdoor fields and milsim deployments. The 24mm CW thread on the discharge device ensures compatibility with a broad selection of tactical accessories and suppressors, expanding your loadout options without sacrificing reliability.

To keep everything running smoothly, pair this carbine with the appropriate power source and accessories from our store. For batteries and chargers, see our batteries and chargers collection. You can also browse compatible BBs in the airsoft bb collection to match your ammo type and performance preferences. For more ideas on how to outfit this rifle, explore our broader tactical gear and airsoft rifles catalogs, or check additional options within the Specna Arms collection and related KPYK collection.

What’s included and how it translates to performance

• Out-of-the-box weight balance and rigidity support rapid, stable follow-up shots in sustained engagements.
• Integrated ETU BLDC electronics provide crisp trigger response and reliable cycling under load — ideal for skirmish scenarios and disciplined CQB pacing.
• Two extra springs included for quick velocity tuning to meet local field rules.
• Space-efficient, under-breech battery storage maintains compact handling and minimizes profile during movement.

Maintenance and care tips

• Regularly inspect the folding stock joints and the screw hardware on the handguard to maintain rigidity after field use.
• Keep the Hop-Up chamber clean and properly adjusted to maintain accuracy across sessions.
• Lubricate moving parts with light airsoft-safe oil and wipe away dust from the rails and mating surfaces after play.
• Periodically check the gearbox screws and quick-spring-change components to ensure reliability during tournaments or milsim events.

Whether you’re carving through a CQB corridor, ruling long-range skirmishes, or joining a milsim operation, a properly tuned Specna Arms x KPYK SA-PJ12 PRIME™ Aster ETU BLDC™ carbine can give you the edge. Explore the broader Specna Arms family for additional configurations and upgrade paths, and connect with the right accessories to tailor this platform to your exact field role.