How to Raise Fps on Airsoft Guns

Written by larry simmons
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The power of an Airsoft gun is usually rated at the speed with which it fires its projectile. Unmodified Airsoft rifles often achieve fired projectile speeds of up to 500 FPS. Since the faster the projectile travels the better your chances of hitting a moving target, increasing the FPS can net immediate results in Airsoft competition. To raise the FPS, you'll have to modify the gun, replacing many of the internal parts, but once completed you'll see substantial changes in the speed of the projectile. Faster, though, does not equate to greater accuracy.

Skill level:
Moderately Challenging

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Things you need

  • Airsoft gun
  • Allen wrench
  • Hammer
  • Tight bore barrel 6.03mm
  • Teflon tape
  • Cylinder chamber replacement kit
  • Spring replacement kit

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  1. 1

    Open the Airsoft rifle casing by removing the Phillips screws holding the casing together. Remove the inner rifle barrel from the outer rifle casing by placing a small Allen wrench into the pin hole on the casing and tapping the end of the wrench with a hammer until the pin slips out. Slide the inner barrel from the outer barrel.

  2. 2

    Replace the old barrel with the new tight-bore barrel. The tighter bore of the barrel means that the projectile will have a smaller diameter to move down when fired, reducing movement and increasing FPS. Place a single layer of Teflon tape around the very end of the barrel at the muzzle end, wrapping the barrel so it snugly fits in the rifle casing. Test for fit inside the casing. If there is slight movement of the barrel within the casing, place additional layers of the tape onto the barrel, testing after each.

  3. 3

    Position a screwdriver through the spring that is located at the rear of the cylinder chamber. Angle the spring upward using the screwdriver. Then slowly move the screwdriver back from the cylinder, releasing the tension in the spring as it decompresses. Lift the cylinder from the casing while the spring is decompressed.

  4. 4

    Remove the rubber gasket cylinder head and replace with a stronger one. The gasket seals the chamber and barrel, maintaining the air pressure. The new gasket should be slightly thicker than the old one to handle the increased air pressure. Both the new gasket head and the new chamber should come combined in a kit specific to your Airsoft gun model when purchased.

  5. 5

    Place the new cylinder chamber on the gasket and casing, and, using the screwdriver, compress the spring back into place. Since the cylinder chamber is where the air that fires the projectiles is compressed, the new cylinder needs to have a greater air capacity and be built to withstand greater air pressure--the greater the cylinder capacity and air pressure, the faster the projectile will travel.

  6. 6

    Replace the existing piston spring to increase FPS in spring-fired rifles. Use a stronger spring to add directly to the projectile speed. Remove the piston and spring located behind the barrel, and replace the spring with the stronger model. Replace the spring guide located directly beneath the spring, which will stop the stronger spring from moving directly into the gear case when fired.

  7. 7

    Reassemble your gun for play.

Tips and warnings

  • Purchase upgrade parts made specifically for your brand and make of Airsoft rifle, placing the wrong upgrade type will cause your rifle to work at less than peak efficiency.
  • Do not reuse ammunition, as use can damage the ammunition slightly, reducing quality.

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