EMG F1 Firearms UDR CO2 Blowback M4 GBB - Black (by APS): specs, joules & FPS
Complete specs EMG CO2
EMG F1 Firearms UDR CO2 Blowback M4 GBB - Black (by APS): 1.14 J, 350 FPS, 2,760 g, 30 rounds. Official specs.
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 | EMG |
|---|---|
| Model | F1 Firearms UDR CO2 Blowback M4 GBB - Black (by APS) |
| Category | Assault rifles & carbines |
| Power source | CO2 |
| Platform | AR/M4 SERIES |
| Weight | 2,760 g |
| Length | 890 mm |
| Magazine | 30 rounds |
| Hop-up | Adjustable |
Weighs 2,760 g: lighter than 57% of CO2 replicas in the same category in the database (65 with weight).
Similar alternatives
Replicas of the same type and category that stay within the Italian 1 J limit.
| Replica | Energy | FPS | Weight |
|---|---|---|---|
| GHK AK74 GBBR | 0.95 J | 320 | 3,460 g |
| VIVA Arms Mosin Nagant M44 Carbine (Real Wood CO2 Version) | 0.95 J | 320 | 3,760 g |
| EMG F1 Firearms UDR GBB M4 GBB w/ G-Box System (Green Gas, Black, by APS) | 1.14 J | 350 | 2,570 g |
| Cybergun M16A1 COLTM653 Carbine 14.5 inch GBB (CGS System) | 1.2 J | 360 | 2,710 g |
| Cybergun M16A2 COLT M723 Carbine 14.5 inch GBB (CGS System) | 1.2 J | 360 | 2,710 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 | 350 | 107 |
| 0.25 g | 313 | 95 |
| 0.28 g | 296 | 90 |
| 0.30 g | 286 | 87 |
| 0.32 g | 277 | 84 |
| 0.36 g | 261 | 80 |
| 0.40 g | 247 | 75 |
Theoretical calculation at constant energy (1.14 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.