Umarex H&K USP GBB (by VFC): specs, joules & FPS
Complete specs Umarex GBB (gas blowback)
Umarex H&K USP GBB (by VFC): 1.07 J, 340 FPS, 820 g, 22 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 | H&K USP GBB (by VFC) |
| Category | Pistols |
| Power source | GBB (gas blowback) |
| Platform | USP |
| Weight | 820 g |
| Length | 196 mm |
| Magazine | 22 rounds |
| Hop-up | Adjustable |
Weighs 820 g: heavier than 52% of GBB replicas in the same category in the database (466 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Novritsch SSP28 Split-Slide GBB | 0.95 J | 320 | 823 g |
| RWC Inokatsu M&P9 Steel Slide Custom | 0.95 J | 320 | 760 g |
| Novritsch SSP18 Gas Blowback Pistol | 0.95 J | 320 | 735 g |
| Umarex HK P8A1 Green Gas (by VFC) | 0.84 J | 300 | 820 g |
| Novritsch SSP2 Gen2 GBB | 1 J | – | 957 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 | 340 | 104 |
| 0.25 g | 304 | 93 |
| 0.28 g | 287 | 88 |
| 0.30 g | 278 | 85 |
| 0.32 g | 269 | 82 |
| 0.36 g | 253 | 77 |
| 0.40 g | 240 | 73 |
Theoretical calculation at constant energy (1.07 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.