KPYK SA-PJ14 PRIME Aster II ETU BLDC airsoft rifle

Specna Arms teams up with KPYK to deliver the SA-PJ14 PRIME™ Aster II ETU BLDC™ airsoft carbine. This collaboration combines durability, precision engineering and modern aesthetics to elevate performance on every airsoft field, whether you’re tearing through CQB, running milsim scenarios, or engaging in long-field skirmishes. Built to out-of-the-box standards, this carbine pairs premium materials with advanced internals for reliable, repeatable performance. Explore related gear in our airsoft rifles and tactical-gear collections, and discover the Specna Arms collection for other high-performance builds.

Key Features

• Collaborative design between Specna Arms and KPYK delivering high build quality, durability and distinctive aesthetics.
• Prime™ J-Series lineage with new internal parts for outstanding performance right out of the box.
• All-steel components on critical parts (barrel, breech cover, outer barrel, trigger guard, magazine catch, selector wing, QD mount, gas tube, stock) plus aluminum sighting devices and handguard overlay for uncompromising rigidity.
• M-LOK mounts and a Picatinny rail enable rapid accessory setup: red dots, lasers, vertical grips, torches and more.
• Nano Coating finish on the body to resist scratches and wear in demanding field conditions.
• Space under the breech cover for a stick-type battery and an adjustable, tactical stock for a custom fit.
• Internal reliability: 8mm J-Cage bearings, CNC steel gears (16:1), reinforced piston and steel cylinder for long service life.
• Rotating TDC Magnus Hop-Up chamber with Helium Flat Hop eraser for precise BB stabilization and accuracy.
• Powerful Specna Arms DarkMatter™ High Speed 27-35K brushless motor paired with the Gate Aster II electronic system for responsive feel and telemetry-ready control.
• Enter & Convert™ Quick Spring Change System for rapid tuning to field conditions.
• Internal layout optimized for stable performance and easy maintenance, including a steel cylinder and 6.02 mm inner barrel.

Performance and Build

• High-strength construction uses steel and aluminum where it matters most, delivering rigidity and durability for milsim and CQB use.
• Quiet, reliable cycling with optimized gearset and a reinforced piston to withstand rigorous use.
• Precise trigger response and consistent shot-to-shot performance thanks to the Magnus Hop-Up and CNC gears.
• Out-of-the-box reliability supports a fast reload cadence and stable accuracy across range.

Internal Systems and Maintenance

• EtU integrated Gate Aster II electronic system (Bluetooth 5.2 capable in related configurations) for advanced tuning and telemetry.
• 8mm J-Cage motor bearings and 8mm plain bearing (center pinion) ensure smooth and durable operation.
• Rotating TDC Magnus Hop-Up chamber provides highly stable BB trajectory and adjustability.
• Steel cylinder and CNC steel gears with a 16:1 gear ratio balance torque and speed for aggressive semi-auto and full-auto modes.
• The body features a Nano Coating finish to resist scratches during intense field use.

Customization and Accessory Ready

• M-LOK handguard and Picatinny rail system support a wide range of accessories (red dots, lasers, grips, torches, etc.).
• Adjustable, tactical stock and polymer grip provide ergonomic control and solid shoulder comfort.
• Built-in space under the breech cover accommodates a compact or stick-type battery for flexible power options.

Included, Ready to Play

• Mid-cap magazine included for reliable loading and stable feeding.
• Enter & Convert system enables fast tuning to changing field conditions without removing the gearbox.

Specifications