STRATOS X MPX-K Copperhead No Brace GBB SMG: specs, joules & FPS
Complete specs STRATOS X Gas NBB (non-blowback)
STRATOS X MPX-K Copperhead No Brace GBB SMG, NBB: 0.84 J, 300 FPS, 1,860 g, 30 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.
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 | STRATOS X |
|---|---|
| Model | MPX-K Copperhead No Brace GBB SMG |
| Category | SMGs |
| Power source | Gas NBB (non-blowback) |
| Platform | MPX |
| Weight | 1,860 g |
| Length | 300 mm |
| Magazine | 30 rounds |
| Hop-up | Adjustable |
Similar alternatives
Same type and category, with similar power and weight.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Maruyama SCW-9 SD Compact GBB | 1.01 J | 330 | 2,130 g |
| RWC Krytac Kriss Vector GBB SMG | 1.04 J | 335 | 2,980 g |
| Northeast STEN GBB MK6 | 1.34 J | 380 | 4,180 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
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.