Specna Arms SA-P21 PRIME BLDC Aster II ETU: specs, joules & FPS
Complete specs Specna Arms AEG (electric)
Specna Arms SA-P21 PRIME BLDC Aster II ETU, AEG: 1.49 J, 400 FPS, 2,375 g, 125 rounds. Full specs from the official source, with FPS for every BB weight.
Power
Above Italy's 1 J limit
Italian shops sell versions tuned below 1 J: ask the shop which version they ship.
Energy computed from the velocity with 0.20 g BBs, the standard weight manufacturers and shops use to measure FPS.
For information only, based on the source's data for this version. Not legal advice: always check current local law and the version the shop sells.
Technical specifications
| Brand | Specna Arms |
|---|---|
| Model | SA-P21 PRIME BLDC Aster II ETU |
| Manufacturer code | SPE-01-043642 |
| Category | Assault rifles & carbines |
| Power source | AEG (electric) |
| Platform | AR15/M4 |
| Weight | 2,375 g |
| Length | 630 mm |
| Inner barrel | 210 mm |
| Magazine | 125 rounds |
| Gearbox | V2 |
| Battery | 7,4 V LiPo · connector Deans (T-plug) |
motore BLDC; lunghezza indicata come 71 cm
Weighs 2,375 g: lighter than 86% of AEG replicas in the same category in the database (873 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Novritsch SSR4 Mk2 AEG | 1 J | 328 | 2,380 g |
| VFC Avalon Gladius (2018) | 1 J | 328 | 2,390 g |
| VFC Avalon Leopard Carbine (2018) | 1 J | 328 | 2,305 g |
| Novritsch SSR4 Mk1 Gen2 AEG | 1 J | 328 | 2,300 g |
| VFC Avalon Calibur II PDW | 1 J | 328 | 2,275 g |
Velocity with different BB weights
At the same energy, heavier BBs leave the barrel slower. Expected velocity with the most common weights:
| BB weight | FPS | m/s |
|---|---|---|
| 0.20 g | 400 | 122 |
| 0.25 g | 358 | 109 |
| 0.28 g | 338 | 103 |
| 0.30 g | 327 | 100 |
| 0.32 g | 316 | 96 |
| 0.36 g | 298 | 91 |
| 0.40 g | 283 | 86 |
Theoretical calculation at constant energy (1.49 J). Real-world values can differ slightly with hop-up and replica.
Data source
The values on this page come from the product page of the shop gunfire.com, checked on 2026-11-07. The manufacturer does not publish full specs: values may refer to the version that shop sells.
Shop product page ↗ gunfire.com
Spotted a wrong or missing value? Let us know.