The best way to do this is to upgrade the spring. Make sure you know how to dissasemble the gun first and do the research on which spring to buy. Maybe have it installed by your local airsoft shop.
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A BB gun is pretty much set as far as FPS goes. If it were a pellet rifle or gun you could use a lighter pellet to make it travel faster. But BB are all about the same in weight so the FPS is always about the same. If you are using a Pump Rifle you can pump it up to the maximum but that's about it. Any over pumping will ruin the air seal.
With enough money, yes. and if you want to increase the fire rate and FPS of it you can just use a biger battery. You can get a spotter witch ups the pps by 100. But you must consider that when upgrading the gearbox of an airsoft, you can't just change one component. for example, if you increase the fps by changing the spring and the spring guide, you also need to upgrade the motor so it has the torque to move the gears and you will need to upgrade the gears so they can move the spring back and forth.
its simple and pretty cheap within reason. if you have an AEG (automatic electric gun) then the FPS can be improved with lubricant, new higher quality springs and air nozzles. also just an added fact the ROF (rate of fire) can be improved with a higher quality torque motor.
now if you have a spring gun you can improve that with a new spring better bbs or lubricant
Gas guns can be improved with lubricant and better bbs.
if your old fashioned and dont want to spend money. me=) i would suggest the lubricant if you have some extra. hoped this helped
There are many internal parts you can replace to increase the fps of your gun. Most basic would be replacing the spring, but most cheaper guns would also need a new gear set and motor to take the strain of a stronger spring. Also, a new air nozzle can prevent air leaks, also increasing fps. Finally, a tight bore barrel will increase your fps by about 10% (if you get a 6.01 mm, also this effect is more like 15-20% for gas guns) while also drastically increasing accuracy.