Umarex HK416A5 GBB (by GHK): specs, joules & FPS
Complete specs Umarex CO2
Umarex HK416A5 GBB (by GHK), CO2: 1.34 J, 380 FPS, 2,990 g, 32 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 | Umarex |
|---|---|
| Model | HK416A5 GBB (by GHK) |
| Category | Assault rifles & carbines |
| Power source | CO2 |
| Platform | AR/M4 SERIES |
| Weight | 2,990 g |
| Length | 710 mm |
| Magazine | 32 rounds |
| Hop-up | Adjustable |
Weighs 2,990 g: heavier than 58% of CO2 replicas in the same category in the database (65 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| GHK AK74 GBBR | 0.95 J | 320 | 3,460 g |
| VIVA Arms Mosin Nagant M44 Carbine (Real Wood CO2 Version) | 0.95 J | 320 | 3,760 g |
| EMG SAI GRY M4 GBB (CYMA CGS System) - 6.5 inch BK | 1.34 J | 380 | 3,080 g |
| EMG SAI GRY M4 GBB (CYMA CGS System) - 10.5 inch BK | 1.34 J | 380 | 3,200 g |
| EMG SAI GRY M4 GBB (CYMA CGS System) - 13.5 inch BK | 1.34 J | 380 | 3,300 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 | 380 | 116 |
| 0.25 g | 340 | 104 |
| 0.28 g | 321 | 98 |
| 0.30 g | 310 | 95 |
| 0.32 g | 300 | 92 |
| 0.36 g | 283 | 86 |
| 0.40 g | 269 | 82 |
Theoretical calculation at constant energy (1.34 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
Spotted a wrong or missing value? Let us know.