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PCP
PCP (Pre-Charged Pneumatic) is a type of air rifle powered by compressed air stored in an onboard reservoir. The reservoir is filled before shooting, typically to 200–250 bar (2,900–3,625 PSI). PCP air rifles rank among the most accurate air guns thanks to minimal recoil and stable shot-to-shot performance. Most models offer magazine-fed shooting and quiet operation, especially when paired with a sound moderator.
How PCP works
The compressed-air reservoir sits beneath the barrel or inside the stock. When the trigger is pulled, a hammer strikes a valve that opens the air supply for a fraction of a second. A short pulse of compressed air drives the pellet through the barrel.
Higher-end PCP air rifles use a regulator. The regulator maintains a steady working pressure (usually 100–150 bar) regardless of the falling pressure in the reservoir. This keeps muzzle velocity variation below 5 FPS between shots. Unregulated rifles have a performance curve – there is a pressure range (sweet spot) where they shoot most consistently.
Shot count per fill depends on caliber and reservoir volume. In .177 (4.5 mm) expect 60–200+ shots, in .22 (5.5 mm) roughly 40–120 shots, and in .25 (6.35 mm) about 30–80 shots.
PCP vs spring-piston air rifle
PCP and spring-piston air rifles differ in both their operating principle and practical characteristics:
| Feature | PCP | Spring-piston |
|---|---|---|
| Accuracy | Very high | Good (requires proper hold technique) |
| Recoil | Almost none | Significant (bidirectional – forward and rearward) |
| Noise | Quiet (very quiet with a moderator) | Louder (spring and piston slam) |
| Cocking | None – just pull the bolt or rotate the side lever | Must break the barrel or cock a lever (~22–55 lbs) |
| Magazine feed | Yes (rotary magazines) | Mostly single-shot |
| Purchase price | Higher (from ~$320) | Lower (from ~$80) |
| Running costs | Pump or compressor (one-time investment) | None – self-contained |
Filling a PCP air rifle
Three methods are available for filling the reservoir with compressed air:
- Hand pump – the most affordable option (~$100–$200). A fill takes roughly 200–300 strokes. Suitable for occasional shooting and travel. Physically demanding, but requires no additional equipment.
- Dive tank – a high-pressure cylinder (200–300 bar) with a fill hose and pressure gauge. One tank lasts for dozens of fills. The tank must be refilled periodically at a specialty facility.
- Compressor – the most convenient option (from ~$320 for compact models). It fills the reservoir in a few minutes from a wall outlet. Worth the investment for regular shooters.
Regardless of the method you choose, inspect O-rings and seals regularly. Dried-out or damaged seals cause air leaks and reduced performance.
Related terms: CO2, sound moderator, joule, FPS