KSC KTR-03 GBB (System 7 Two): specs, joules & FPS
Complete specs KSC GBB (gas blowback)
KSC KTR-03 GBB (System 7 Two): 1.64 J, 420 FPS, 3,800 g, 40 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 | KSC |
|---|---|
| Model | KTR-03 GBB (System 7 Two) |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | AK SERIES |
| Weight | 3,800 g |
| Length | 900 mm |
| Magazine | 40 rounds |
| Hop-up | Adjustable |
Weighs 3,800 g: heavier than 92% of GBB replicas in the same category in the database (314 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| VFC HK53 GBB | 1 J | 328 | 3,200 g |
| WE AK74 GBB (Real Wood Version) | 0.63 J | 260 | 3,440 g |
| Tokyo Marui CQBR Block 1 GBB | 0.95 J | 320 | 3,110 g |
| Tokyo Marui M4A1 MWS | 0.95 J | 320 | 2,970 g |
| Novritsch SSQ22 Gen2 GBB | 1 J | 328 | 1,800 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 | 420 | 128 |
| 0.25 g | 376 | 115 |
| 0.28 g | 355 | 108 |
| 0.30 g | 343 | 105 |
| 0.32 g | 332 | 101 |
| 0.36 g | 313 | 95 |
| 0.40 g | 297 | 91 |
Theoretical calculation at constant energy (1.64 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.