KTW SPAS Custom Shotgun: specs, joules & FPS
Complete specs KTW Spring
KTW SPAS Custom Shotgun, spring: 1.31 J, 375 FPS, 1,740 g, 60 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.
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 | KTW |
|---|---|
| Model | SPAS Custom Shotgun |
| Category | Shotguns |
| Power source | Spring |
| Platform | SPAS |
| Weight | 1,740 g |
| Length | 960 mm |
| Magazine | 60 rounds |
| Hop-up | Adjustable |
Weighs 1,740 g: lighter than 65% of spring replicas in the same category in the database (17 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| BO Manufacture FABARM Licensed STF12 11 inch Compact Spring Shotgun | 0.89 J | 310 | 1,770 g |
| BO Manufacture FABARM Licensed STF12 18 inch Ressort Spring Shotgun | 0.89 J | 310 | 1,840 g |
| BO Manufacture FABARM Licensed STF12 11 inch Short Spring Shotgun | 0.89 J | 310 | 1,260 g |
| Tokyo Marui SPAS-12 | 0.75 J | 285 | 2,000 g |
| Tokyo Marui M3 Shorty | 0.65 J | 265 | 1,538 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 | 375 | 114 |
| 0.25 g | 335 | 102 |
| 0.28 g | 317 | 97 |
| 0.30 g | 306 | 93 |
| 0.32 g | 296 | 90 |
| 0.36 g | 280 | 85 |
| 0.40 g | 265 | 81 |
Theoretical calculation at constant energy (1.31 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.