Umarex MP5K GBB (by VFC): specs, joules & FPS
Complete specs Umarex GBB (gas blowback)
Umarex MP5K GBB (by VFC): 1.14 J, 350 FPS, 2,300 g, 30 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 | MP5K GBB (by VFC) |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | MP5 MP7 MP9 |
| Weight | 2,300 g |
| Length | 320 mm |
| Magazine | 30 rounds |
| Hop-up | Adjustable |
Weighs 2,300 g: lighter than 92% of GBB replicas in the same category in the database (314 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Novritsch SSQ22 Gen2 GBB | 1 J | 328 | 1,800 g |
| Cybergun Thompson M1A1 GBBR (by WE) | 0.98 J | 325 | 2,690 g |
| Lancer Tactical SOLGW Licensed MK1 CAR 11.5inch 5.56 MWS GBB (by Toxicant) - Black (#TAAS) | 0.95 J | 320 | 1,920 g |
| Lancer Tactical SOLGW Licensed MK1 CAR 11.5inch 5.56 MWS GBB (by Toxicant) - Grey (#TAAS) | 0.95 J | 320 | 1,920 g |
| CYMA Strike Industries x EMG Raider PDW CGS CQB GBBR 4 | 0.84 J | 300 | 2,425 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 | 350 | 107 |
| 0.25 g | 313 | 95 |
| 0.28 g | 296 | 90 |
| 0.30 g | 286 | 87 |
| 0.32 g | 277 | 84 |
| 0.36 g | 261 | 80 |
| 0.40 g | 247 | 75 |
Theoretical calculation at constant energy (1.14 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.