Tokyo Marui Mk18 Mod 1 GBB: specs, joules & FPS
Complete specs Tokyo Marui GBB (gas blowback)
Tokyo Marui Mk18 Mod 1 GBB: 0.84 J, 300 FPS, 2,960 g, 35 rounds. Full specs from the official source, with FPS for every BB weight.
Power
Within Italy's 1 J limit
Energy computed from the velocity with 0.20 g BBs, the standard weight manufacturers and shops use to measure FPS.
The main source does not give the velocity: FPS taken from the page of the same model on www.redwolfairsoft.com.
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 | Tokyo Marui |
|---|---|
| Model | Mk18 Mod 1 GBB |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | AR15/M4 |
| Weight | 2,960 g |
| Length (collapsed / extended) | 715 / 790 mm |
| Inner barrel | 250 mm |
| Magazine | 35 rounds |
| Hop-up | Adjustable |
Weighs 2,960 g: heavier than 60% of GBB replicas in the same category in the database (314 with weight).
At 0.84 J it is more powerful than 36% of GBB replicas in the same category that stay within 1 J (28).
Similar alternatives
Same type and category, with similar power and weight.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Tokyo Marui MTR16 | 0.84 J | 300 | 2,676 g |
| Tokyo Marui MTR16 G Edition | 0.84 J | 300 | 2,676 g |
| Tokyo Marui M4A1 MWS | 0.95 J | 320 | 2,970 g |
| Tokyo Marui CQBR Block 1 GBB | 0.95 J | 320 | 3,110 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 | 300 | 91 |
| 0.25 g | 268 | 82 |
| 0.28 g | 254 | 77 |
| 0.30 g | 245 | 75 |
| 0.32 g | 237 | 72 |
| 0.36 g | 224 | 68 |
| 0.40 g | 212 | 65 |
Theoretical calculation at constant energy (0.84 J). Real-world values can differ slightly with hop-up and replica.
Data source
Every value on this page comes from the manufacturer's official product page, checked on 2026-11-07.
Official Tokyo Marui product page ↗ tokyo-marui.co.jp
Spotted a wrong or missing value? Let us know.