An M110 spring, when installed in an Airsoft Electric Gun (AEG) with a good air seal, is generally expected to yield 360 Feet Per Second (FPS) when firing 0.2g BBs. This specific FPS rating is a common benchmark for airsoft enthusiasts and players to understand the power output of their replica.
Factors Affecting FPS Performance
While 360 FPS is a good estimate, the actual performance can vary due to several factors:
- Air Seal Quality: A perfect air seal ensures that all the air compressed by the piston is directed behind the BB, maximizing FPS. Leaks can significantly reduce performance.
- Inner Barrel Length and Diameter: Longer and tighter inner barrels can slightly increase FPS, while wider or shorter barrels might result in lower velocities.
- Hop-Up Unit and Bucking: A well-tuned hop-up and a high-quality bucking contribute to consistent air seal and efficient BB propulsion.
- Gearbox Components: The overall efficiency and alignment of internal gearbox components can also subtly impact the final FPS.
- BB Weight: While the 360 FPS figure is for 0.2g BBs, using heavier BBs (e.g., 0.25g, 0.3g) will result in a lower muzzle velocity (FPS) but often provide better accuracy and range. Conversely, lighter BBs would show a higher FPS.
Practical Considerations for Skirmishing
It's important to note that an AEG firing at 360 FPS on 0.2g BBs, especially if full automatic fire is still functional, might exceed the FPS limits of many airsoft skirmish sites or fields. Most outdoor fields have a maximum FPS limit, typically ranging from 350-400 FPS for AEGs on full auto.
- Field Regulations: Always check the specific FPS limits of the airsoft field you intend to play at. Exceeding these limits can prevent you from participating.
- Safety: Higher FPS means more impact energy, which can be less safe at close ranges. Fields enforce limits to ensure player safety.
- Engagement Distances: Some fields may allow higher FPS for DMRs (Designated Marksman Rifles) or sniper rifles, but these often come with Minimum Engagement Distances (MEDs) and require semi-automatic only firing modes.
Therefore, while an M110 spring provides a predictable power output, consider its practical implications for gameplay and field legality before installation.
