Gunsmith Bros GB01 TF Aluminum 5.5 inch GBB Airsoft Pistol: specs, joules & FPS
Partial data Gunsmith Bros GBB (gas blowback)
Gunsmith Bros GB01 TF Aluminum 5.5 inch GBB Airsoft Pistol: 1.27 J, 370 FPS, 710 g, 31 rounds. Official specs.
Power
Above Italy's 1 J limit
Italian shops sell versions tuned below 1 J: ask the shop which version they ship.
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 | Gunsmith Bros |
|---|---|
| Model | GB01 TF Aluminum 5.5 inch GBB Airsoft Pistol |
| Manufacturer code | n/a |
| Category | Pistols |
| Power source | GBB (gas blowback) |
| Platform | CZ75 |
| Weight | 710 g |
| Length | 245 mm |
| Inner barrel | n/a |
| Magazine | 31 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 | 370 | 113 |
| 0.25 g | 331 | 101 |
| 0.28 g | 313 | 95 |
| 0.30 g | 302 | 92 |
| 0.32 g | 293 | 89 |
| 0.36 g | 276 | 84 |
| 0.40 g | 262 | 80 |
Theoretical calculation at constant energy (1.27 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.
Available colours
The same model is also sold in these colours. The specs on this page refer to the first version; each colour links to its own page at the source.