VFC MK12 MOD1 GBB M4 (Colt, Restractable Stock): specs, joules & FPS
Complete specs VFC GBB (gas blowback)
VFC MK12 MOD1 GBB M4 (Colt, Restractable Stock): 1.72 J, 430 FPS, 2,910 g, 35 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 | VFC |
|---|---|
| Model | MK12 MOD1 GBB M4 (Colt, Restractable Stock) |
| Category | Assault rifles & carbines |
| Power source | GBB (gas blowback) |
| Platform | AR/M4 SERIES |
| Weight | 2,910 g |
| Length | 907 mm |
| Magazine | 35 rounds |
| Hop-up | Adjustable |
Weighs 2,910 g: heavier than 52% 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 |
|---|---|---|---|
| ARCHWICK Colt Canada L119A2 British Special Forces Rifle AWS GBB (Ultimate Edition) | 0.95 J | 320 | 2,810 g |
| EMG Noveske N4 M4 GBB (MWS System) by Double Eagle - DE (Gen2) | 0.95 J | 320 | 2,750 g |
| Tokyo Marui URGI MK16 MWS GBBR (11.5 inch SOPMOD Block 3) | 0.84 J | 300 | 2,710 g |
| RWA B.A.D. 556-LW GBBR | 0.84 J | 300 | 2,570 g |
| Tokyo Marui M4 MWS (ZET System) GBBR M4 | 0.73 J | 280 | 2,960 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 | 430 | 131 |
| 0.25 g | 385 | 117 |
| 0.28 g | 363 | 111 |
| 0.30 g | 351 | 107 |
| 0.32 g | 340 | 104 |
| 0.36 g | 321 | 98 |
| 0.40 g | 304 | 93 |
Theoretical calculation at constant energy (1.72 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.