KTW Ithaca M37 Feather Light: specs, joules & FPS
Complete specs KTW Spring
KTW Ithaca M37 Feather Light, spring: 0.43 J, 215 FPS, 1,400 g, 42 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 | KTW |
|---|---|
| Model | Ithaca M37 Feather Light |
| Category | Shotguns |
| Power source | Spring |
| Platform | M37 |
| Weight | 1,400 g |
| Length | 1,020 mm |
| Magazine | 42 rounds |
| Hop-up | Adjustable |
Weighs 1,400 g: lighter than 76% of spring replicas in the same category in the database (17 with weight).
At 0.43 J it is more powerful than 8% of spring replicas in the same category that stay within 1 J (13).
Similar alternatives
Same type and category, with similar power and weight.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| Tokyo Marui M3 Shorty | 0.65 J | 265 | 1,538 g |
| Maruzen CA870 TAC-10 Shotgun | 0.73 J | 280 | 1,300 g |
| BO Manufacture FABARM Licensed STF12 11 inch Short Spring Shotgun | 0.89 J | 310 | 1,260 g |
| Tokyo Marui M3 Super 90 | 0.65 J | 265 | 2,000 g |
| BO Manufacture FABARM Licensed STF12 11 inch Compact Spring Shotgun | 0.89 J | 310 | 1,770 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 | 215 | 66 |
| 0.25 g | 192 | 59 |
| 0.28 g | 182 | 55 |
| 0.30 g | 176 | 54 |
| 0.32 g | 170 | 52 |
| 0.36 g | 160 | 49 |
| 0.40 g | 152 | 46 |
Theoretical calculation at constant energy (0.43 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.