KWC SPRING Sigma SW40F (Heavy Weight): specs, joules & FPS
Complete specs KWC Spring
KWC SPRING Sigma SW40F (Heavy Weight): 0.37 J, 200 FPS, 900 g, 14 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 | KWC |
|---|---|
| Model | SPRING Sigma SW40F (Heavy Weight) |
| Category | Pistols |
| Power source | Spring |
| Platform | OTHER |
| Weight | 900 g |
| Length | 198 mm |
| Magazine | 14 rounds |
| Hop-up | Fixed |
Weighs 900 g: heavier than 100% of spring replicas in the same category in the database (26 with weight).
At 0.37 J it is more powerful than 33% of spring replicas in the same category that stay within 1 J (27).
Similar alternatives
Same type and category, with similar power and weight.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| KTW Flintlock Pistol (Air Cocking Gun) | 0.41 J | 210 | 740 g |
| Umarex WALTHER PPQ Metal Slide Spring | 0.58 J | 250 | 810 g |
| Tokyo Marui Spring P7M13 (High Grade) | 0.45 J | 220 | 600 g |
| Tokyo Marui KP85 Ruger Spring (High Grade) | 0.41 J | 210 | 460 g |
| ASG DL 60 SOCOM Spring with B.E.T | 0.34 J | 190 | 650 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 | 200 | 61 |
| 0.25 g | 179 | 55 |
| 0.28 g | 169 | 52 |
| 0.30 g | 163 | 50 |
| 0.32 g | 158 | 48 |
| 0.36 g | 149 | 45 |
| 0.40 g | 141 | 43 |
Theoretical calculation at constant energy (0.37 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.