EMG FN Herstal Licensed FN 509 GBB - DE (by Double Eagle): specs, joules & FPS
Partial data EMG GBB (gas blowback)
EMG FN Herstal Licensed FN 509 GBB - DE (by Double Eagle): 0.81 J, 295 FPS, 750 g, 20 rounds. Official specs.
Power
Within Italy's 1 J limit
Estimated energy: the source does not give the BB weight, so we used 0.20 g, the standard weight manufacturers and shops use to measure velocity. With other BBs the value changes: always check with a chronograph.
For information only, based on the energy the manufacturer declares for this version. Not legal advice: always check current local law and the version the shop sells.
Technical specifications
| Brand | EMG |
|---|---|
| Model | FN Herstal Licensed FN 509 GBB - DE (by Double Eagle) |
| Manufacturer code | n/a |
| Category | Pistols |
| Power source | GBB (gas blowback) |
| Platform | FNX & FNS |
| Weight | 750 g |
| Length | 235 mm |
| Inner barrel | n/a |
| Magazine | 20 rounds |
| Hop-up | Adjustable |
| EAN / UPC | n/a |
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 | 295 | 90 |
| 0.25 g | 264 | 80 |
| 0.28 g | 249 | 76 |
| 0.30 g | 241 | 73 |
| 0.32 g | 233 | 71 |
| 0.36 g | 220 | 67 |
| 0.40 g | 209 | 64 |
Theoretical calculation at constant energy (0.81 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 redwolfairsoft.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 ↗ redwolfairsoft.com
Not declared by the manufacturer: Inner barrel.