This is the ultimate guide to Airsoft FPS (muzzle velocity) issues.
What is the airsoft fps term?
The muzzle velocity, expressed in
fps (feet per second) is the
muzzle velocity of airsoft replicas. It is the speed that the BB has when it leaves the barrel of the airsoft gun.
Many people believe, the more fps an airsoft replica has, the better. To some extent it is true, but here are the bare facts.
The fps in airsoft means only that a certain BB will have a certain muzzle velocity. In most cases for most replicas it is measured for 0.2 g BB, but be sure to check it. If you find a suspiciously cheap replica with high fps, it probably means it was measured on 0.12 g BB and on 0.2 g BB would have less fps.
The fps also means that the BB fired from this replica will have a specific kinetic energy, calculated from the formula E=m*V
2/2, where m is the mass of BB (0.2 g for example) and V is the fps. The more the energy of the BB, the longer range you can shoot. And the more pain you will cause when hitting someone.
fps vs range in airsoft
Yes, the bigger the fps for a replica, the longer it's range may be!
But the range is not determined only on the fps of an airsoft replica. The range is determined mostly by the
hop-up system of the replica. This system rotates the BB so it will not fall on the ground after flying 20 meters.
A cheap replica may have large fps, but that does not necessarily means it has long range. It is not said it might be used as sniper rifle!
fps vs accuracy in airsoft
fps does not determine accuracy. Accuracy depends on the lenght of the barrel and the quality of the hop-up system. If you install tightbore (precise inner barrel) for your electric airsoft replica, it will slightly increase your fps (by 5-10 fps or so) but will surely increase the accuracy of your replica.
To be honest, the bigger the fps, the smaller the accuracy. Try using 0.12 g BBs in your AEG of 300 fps and you will see what I mean. To use this high muzzle velocity you need to use heavier BBs, for example the 0.2 g BBs are recommended only for replicas that have less than 300 fps! For 400 fps you should use 0.23-0.25 g BBs, for sniper rifles of 540-550 fps you should use 0.36-0.43 g BBs. Lighter BBs will be fired in random directions.