KPYK SA-PJ13 PRIME Aster ETU BLDC

Specna Arms x KPYK SA-PJ13 PRIME™ Aster ETU BLDC™ Carbine Olive

The Specna Arms x KPYK SA-PJ13 PRIME™ Aster ETU BLDC™ airsoft Carbine is the result of a close collaboration between Specna Arms and KPYK. Built for durability, reliability, and field-ready performance, this carbine blends Specna Arms’ renowned build quality with KPYK’s modern accessories to deliver a platform that excels on airsoft fields, CQB, and milsim scenarios. Explore the airsoft rifles collection to see how this line stacks up against other high-performance carbines, and check related tactical gear for a full loadout. The collaboration sits at the intersection of durability, design, and practical play, making it a top choice for players who demand precision out of the box. Specna Arms is renowned for its consistent quality and real-world reliability, and this model continues that tradition with refined internals and rugged externals.

Key features

• GATE Aster ETU electronic system with advanced control for immediate trigger response and stable power management.
• Rotating Magnus™ Hop-Up and TDC chamber for highly accurate and repeatable BB placement across ranges.
• Fully steel components including the barrel, breech chamber cover, outer barrel, trigger guard, magazine catch, selector wing, gas tube, and folding buttstock hardware for exceptional durability in rough field conditions.
• Aluminium sighting instruments, discharge device, dovetail mount, and handguard with CRC 1U020 gas tube overlay for added rigidity and heat resistance.
• M-LOK rails and a Picatinny rail along the top to attach red dot sights, lasers, vertical grips, torches, and more for mission-specific setups.
• Folding stock for compact transport and tight CQB maneuvering.
• ESA2™ quick spring change system for fast field tuning without disassembly.
• 8mm J-Cage bearings and 8mm slide bearings plus a steel cylinder and CNC steel gears with a 16:1 ratio for robust, precise cycling.
• 6.02mm precision inner barrel paired with a Rotating TDC Magnus Hop-Up chamber for consistent BB stabilization.
• Ambidextrous-friendly design with a side-mounted dovetail rail and ample battery space under the breech cover for a stick-type battery.

Performance and field-ready benefits

Right out of the box, this carbine is tuned for performance at airsoft fields, CQB arenas, and long-distance milsim missions. The combination of a high-speed brushless motor (Specna Arms DarkMatter™ High Speed 27–35K) and the Aster electronic control ensures rapid trigger response and smooth, consistent semi and full-auto fire. The steel and aluminum construction minimizes wear during extended skirmishes, while the M-LOK and Picatinny rails enable a modular loadout tailored to your playstyle. The Nano Coating finish protects against scratches and daily field wear, maintaining a pristine look under heavy use. This model accepts a wide range of accessories and is compatible with common batteries and chargers in our batteries and chargers selection. For those seeking further refinements, this is a natural fit for players who want to run a compact, versatile carbine on the airsoft rifles lineup.

Build and components

Specna Arms’ design philosophy blends durability with real-world usability. The SA-PJ13 PRIME™ Aster ETU BLDC™ features a Nano Coating finish to resist scratches, an 8mm gearbox setup with high-quality bearings and gears, a steel cylinder, and a reinforced piston. The handguard’s gas tube overlay and the 24mm CW threaded discharge device add functional versatility for field modifications. The folding stock, dual battery access options, and the quick-spring-change system make on-site adjustments straightforward, ensuring you stay mission-ready between rounds.

What’s in the box and compatibility

Designed for immediate action, this carbine is compatible with a broad range of optics, tac lights, and grips thanks to the M-LOK and Picatinny rails. The internal layout emphasizes reliability and serviceability, with access to the spring guide via the breech cover after removing the cover—no need to strip the gearbox to reach critical components. For players upgrading their loadout, pair this carbine with batteries, chargers, and spare magazines from our batteries and chargers collection and airsoft BBs to optimize performance on every field.

Brand and collaboration notes

Specna Arms is a trusted name in European airsoft, known for quality, consistency, and field-proven performance. This collaboration with KPYK brings together two strengths: Specna’s robust build and KPYK’s modern firearm-accessory innovations, resulting in a elite performing carbine that remains practical for everyday skirmish play. For more elite builds, explore our Specna Arms collection

airsoft rifles • tactical gear • bags and backpacks • airsoft BBs

Meta description: Specna Arms x KPYK SA-PJ13 PRIME Aster ETU BLDC Carbine — high-performance, durable CQB-ready airsoft with ETU and precision Hop-Up.

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