G&P Madbull Licensed Troy 7.5 inch M4 GBBR: specs, joules & FPS
Partial data G&P GBB (gas blowback)
G&P Madbull Licensed Troy 7.5 inch M4 GBBR: 1.07 J, 340 FPS, 2,690 g, 50 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.
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 | G&P |
|---|---|
| Model | Madbull Licensed Troy 7.5 inch M4 GBBR |
| Manufacturer code | n/a |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | AR/M4 SERIES |
| Weight | 2,690 g |
| Length | 543 mm |
| Inner barrel | n/a |
| Magazine | 50 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 | 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
Not declared by the manufacturer: Inner barrel.