EMG FN Herstal Licensed FN 509 GBB - Black (by Double Eagle): specs, joules & FPS

Complete specs EMG GBB (gas blowback)

EMG FN Herstal Licensed FN 509 GBB - Black (by Double Eagle): 0.81 J, 295 FPS, 750 g, 20 rounds. Official specs.

Power

Energy · computed0.81 J
Velocity295 FPS90 m/s

Within Italy's 1 J limit

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

BrandEMG
ModelFN Herstal Licensed FN 509 GBB - Black (by Double Eagle)
CategoryPistols
Power sourceGBB (gas blowback)
PlatformFNX & FNS
Weight750 g
Length235 mm
Magazine20 rounds
Hop-upAdjustable

Weighs 750 g: lighter than 65% of GBB replicas in the same category in the database (466 with weight).

At 0.81 J it is more powerful than 41% of GBB replicas in the same category that stay within 1 J (351).

Similar alternatives

Same type and category, with similar power and weight.

ReplicaEnergyFPSWeight
EMG FN Herstal Licensed FN 509 GBB - DE (by Double Eagle)0.81 J295750 g
VFC SA 226T0.81 J295765 g
G&G GTP 90.84 J300770 g
VFC SA 320T0.81 J295798 g
VFC SA 3200.81 J295675 g

Velocity with different BB weights

At the same energy, heavier BBs leave the barrel slower. Expected velocity with the most common weights:

BB weightFPSm/s
0.20 g29590
0.25 g26480
0.28 g24976
0.30 g24173
0.32 g23371
0.36 g22067
0.40 g20964

Theoretical calculation at constant energy (0.81 J). Real-world values can differ slightly with hop-up and replica.

Try other values in the joule ↔ FPS converter →

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

Spotted a wrong or missing value? Let us know.

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