Umarex IWI Tavor SAR GBBR (by KWA): specs, joules & FPS
Partial data Umarex GBB (gas blowback)
Umarex IWI Tavor SAR GBBR (by KWA): 1.8 J, 440 FPS, 3,740 g, 36 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.
Estimated energy: the source does not give the BB weight, so we used 0.20 g, the standard weight manufacturers and shops use to measure velocity. With other BBs the value changes: always check with a chronograph.
For information only, based on the energy the manufacturer declares for this version. Not legal advice: always check current local law and the version the shop sells.
Technical specifications
| Brand | Umarex |
|---|---|
| Model | IWI Tavor SAR GBBR (by KWA) |
| Manufacturer code | n/a |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | TAR21 |
| Weight | 3,740 g |
| Length | 700 mm |
| Inner barrel | n/a |
| Magazine | 36 rounds |
| Hop-up | Adjustable |
| EAN / UPC | n/a |
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 | 440 | 134 |
| 0.25 g | 394 | 120 |
| 0.28 g | 372 | 113 |
| 0.30 g | 359 | 110 |
| 0.32 g | 348 | 106 |
| 0.36 g | 328 | 100 |
| 0.40 g | 311 | 95 |
Theoretical calculation at constant energy (1.8 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
Not declared by the manufacturer: Inner barrel.