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"This is an accomplished AK replica, both realistic and effective. The collaboration with KPYK has resulted in a very modern AK. Its modularity clearly makes the difference, both externally and internally. Whatever the terrain or style of play required, adaptation is immediate via the application or a quick spring change."
Quentin
Content Editor
The SA-PJ21 PRIME Aster ETU BLDC Carbine is the product of a collaboration between Specna Arms and KPYK, a Ukrainian manufacturer specializing in modern accessories, with strong expertise in AK platforms. KPYK 's approach is based on a balance between robustness, functional design and efficiency in the field, so that each element provides a real benefit in handling or configuration. Specna Arms is building on this partnership to develop the Prime™ J-Series range, an evolution of the J-Series Edge 2.0™ enriched with new internal components and technical elements, with the aim of offering a high-performance, durable replica right out of the box. This "ready-to-play" approach is notably reinforced by the Specna Arms Magnus™ hop-up chamber with TDC (Top Down Center) adjustment, designed to offer a more stable and precise setting.
Externally, the SA-PJ21 PRIME stands out for a design very much oriented around solidity, based mostly on steel. Steel components include the barrel, dust cover, outer barrel, trigger guard, mag release, selector, strap attachment point, gas tube and various structural components. Aluminum is used on key parts such as the sights, muzzle device, moving part with cocking lever, stock guides, and above all the KPYK CRC 1U020 handguard, which is one of the visual and ergonomic signatures of this configuration. Thanks to the M-LOK interfaces and Picatinny rail, the replica is designed to be easily configured with optics, light, laser or vertical grip, depending on playing style and terrain. The pistol grip, adjustable tactical stock and mid-cap magazines are made of polymer to preserve grip and limit weight on contact elements.
The finish benefits from a Nano Coating designed to limit the appearance of marks and scratches, an appreciable point on a replica used regularly. The black metallic flame arrestor is mounted on a 24 mm CW thread, and the whole unit has been designed to remain practical in use, with a battery compartment under the dust cover, offering the necessary space for a LiPo stick battery. The replica adopts an adjustable tactical stock, and power adaptation is simplified thanks to the ESA2 quick-change spring system, designed to provide easy access to the spring guide.
Internally, the SA-PJ21 relies on a reinforced configuration aimed at consistency and longevity. These include 8 mm bearings and a bearing on the central pinion, a steel cylinder, a set of 16:1 steel CNC gears, and a reinforced piston with steel teeth, designed to withstand intensive use and high reactivity. Precision relies on a 6.02 mm barrel, combined with the Magnus™ TDC rotating hop-up chamber and Helium™ Flat Hop seal, to improve ball stability and trajectory consistency. The heads and nozzle are advertised in aluminum, and the replica comes with two additional springs M90 and M135, allowing power to be adjusted according to field constraints or game format.
Cadence and firing response are entrusted to the Specna Arms DarkMatter™ High Speed 27K brushless motor, while electronic management relies on the GATE ASTER II Bluetooth. These electronics provide access to settings and telemetry, and add advanced functions such as adjustable active brake, pre-cocking with the option of pre-cocking to preserve springs and gears, a sniper mode, low battery warning, improved cycle detection and additional protection thanks to a multi-layer PCB with EMC shielding. Advanced settings and firmware updates are via the GCS app on iOS and Android, with online updates, and the option of using a mechanical trigger lock is also provided.
The replica comes with a complete set including 2 S-MAG 175 ball mid-cap magazines, a mini-Tamiya to Deans adapter, a speedloader, a cleaning rod, as well as M90 and M135 springs. The SA-PJ21 PRIME is aimed at players who want a modernized, ergonomic AK replica, with a KPYK external and a Prime internal designed to offer high reactivity, a high level of comfort and a high level of performance.designed to deliver high responsiveness, excellent precision and overall consistency right out of the box.
For regular maintenance of your SA-PJ21 PRIME Aster ETU BLDC Carbine KPYK x Specna Arms AEG replica, you can clean the inside of the barrel with a piece of paper towel at the end of a cleaning/cleaning rod.
A simple wipe with a dry or slightly dampened microfiber is all it takes to clean the outside of the replica.
The Top Cover of the SA-PJ21 PRIME Aster ETU BLDC Carbine KPYK x Specna Arms AEG replica supports a 7.4V LiPo battery with T-dean connectivity in single or double stick versions.
We recommend using high-quality 0.25g bbs with this SA-PJ21 PRIME Aster ETU BLDC Carbine KPYK x Specna Arms AEG replica.
Store your SA-PJ21 PRIME Aster ETU BLDC Carbine KPYK x Specna Arms AEG replica in a dry, ventilated area to prevent wear and corrosion.
We also recommend storing your battery in a protective LiPo bag.
1 x Replica SA-PJ21 PRIME Aster ETU BLDC Carbine KPYK x Specna Arms AEG
2 x S-MAG Mid-Cap 175 bbs magazines
1 x Additional M135 spring
1 x Additional M90 spring
1 x T-Dean / Mini Tamiya adapter
1 x BB Loader
1 x Cleaning / deburrer rod
