PCP Air Rifles

PCP versus spring-piston and CO2: what actually changes at the trigger

A PCP air rifle stores air at up to roughly 300 bar (about 4,350 psi) in an onboard cylinder or bottle. Pulling the trigger releases a metered burst of that stored air behind the pellet or slug, rather than compressing a spring or bleeding a CO2 capsule on every shot. That difference is why PCP rifles feel recoilless compared with a spring-piston rifle, and why they hold a tighter shot-to-shot velocity than CO2, which loses pressure as the capsule cools during a string of shots.

The trade-off is preparation rather than shot-to-shot effort. A PCP rifle needs refilling once the reservoir drops below its working pressure, using a hand pump, a dive bottle or a compressor, which we cover further down this page. A spring-piston rifle needs no external air source at all but has to be cocked before every shot, and CO2 rifles run on disposable or refillable 12g or 88g capsules with no separate charging step. If a spring rifle or CO2 pistol is closer to what you are after, see our CO2 air rifles.

Regulated or unregulated: what changes in shot count and consistency

An unregulated PCP rifle fires directly off the reservoir pressure, so velocity follows a curve: low at very high fill pressure, peaking through a “sweet spot”, then dropping off as the reservoir empties. A regulated rifle adds a valve between the reservoir and the firing valve that holds a fixed setpoint, so the plenum feeding the shot stays at the same pressure until the reservoir itself drops below that setpoint. In practice this extends the number of shots that share the same extreme spread, which is the real number that matters for group size at distance, not the total shot count printed on a spec sheet.

Most of the higher-end platforms in this range, including the FX Impact M4 and the FX Panthera MKII, ship regulated from the factory. Several AEA and Reximex models are sold as unregulated but accept an aftermarket external regulator, which is the same principle Huma-Air builds into its own MOD-series and inline regulators: a fixed plenum pressure instead of a falling one.

Cocking systems in this range: side lever, bolt action and semi-automatic

Filter by cocking system on this page and the split is clear: 176 of the current listings use a side lever, 22 are semi-automatic, and 21 use a separate bolt action. The table below uses those same filter counts.

None of these change the reservoir or the regulator, only how the next shot gets loaded. For high-volume pest control or field target, the side lever’s speed is the reason it now dominates the catalogue; for a first PCP rifle, a bolt action gives you one less thing to learn at once.

Refilling a PCP air rifle: hand pump, compressor or dive bottle

A hand pump is the cheapest way in, works anywhere, and is genuinely hard work above 200 bar. A carbon fibre dive bottle refills a rifle in seconds and needs refilling itself at a dive shop or from a compressor. An HPA compressor is the highest upfront cost but removes the refill errand entirely, which is why most shooters who fire more than a few tins of pellets a month move to one within the first year.

Whichever route you choose, never fill a cylinder or bottle above the pressure stamped on it. Carbon fibre and steel bottles carry a hydrostatic test date and a service life, both marked on the bottle itself, and using one past that date is a real risk, not a formality. Use clean, dry air: moisture is the single biggest cause of corrosion inside a regulator or valve and the most common reason a rifle needs an unscheduled service. Before removing a regulator, fill probe or any fitting, bleed the system down to zero first. See how a regulator works for the setpoint and plenum concepts behind this, and our HPA compressors if you are ready to stop pumping by hand.

Choosing a calibre from .177 to .72

.22/5.5 mm is the biggest single group in this range at 187 models, followed by .25/6.35 mm at 177 and .177/4.5 mm at 87, which between them cover target shooting, pest control and general use where trajectory and pellet cost matter more than downrange energy. .30/7.62 mm (113 models) is the usual entry point into slugs and bigger energy without moving into full big bore territory. From .35/9 mm upward the range gets specialised fast: 40 models in .35/9 mm, dropping to 18 in .45/11.4 mm and .50/12.7 mm, and down to single figures at .58/14.73 mm and .72/18.3 mm, where these become dedicated big bore platforms rather than all-round rifles. For a first PCP rifle covering the widest use, .22 or .25 remains the practical starting point; if big bore energy is the actual goal, our big bore PCP air rifles narrows the 244 listings down to that specific group.

Moderators, noise and shot count in the real world

A PCP rifle is not silent at the muzzle; there is always some air escaping behind the pellet, and the biggest reduction in that noise comes from a moderator matched to the barrel’s thread, not from the powerplant itself. Thread size, chamber count and moderator length all affect how much of that muzzle blast is removed, which is why we treat it as its own subject rather than a footnote here: see our airgun moderators range for the fitment detail by thread and platform.

Shipping is worldwide from our Borne, Netherlands warehouse, and orders placed before 14.00 (GMT+1) go out the same day where possible. Full terms, including who is responsible for import duties outside the EU, are on our shipping information page. Whether a particular calibre, energy level or moderator is permitted for your intended use depends entirely on the laws of your own country; nothing on this page should be read as a statement that a product is legal to own, import or use in any specific jurisdiction.

What is the difference between a PCP air rifle and a spring-piston or CO2 rifle?

A PCP rifle stores compressed air in a reservoir and releases a metered burst per shot, so it has no cocking recoil between shots. A spring-piston rifle compresses a spring on every cocking stroke, which produces recoil in two directions. A CO2 rifle runs on a gas capsule that loses pressure as it cools during a string of shots. PCP typically gives the flattest shot-to-shot consistency of the three, at the cost of needing a separate way to refill the reservoir.

What is the difference between a regulated and an unregulated PCP air rifle?

An unregulated rifle fires directly off the falling reservoir pressure, so velocity follows a curve with a “sweet spot” in the middle. A regulated rifle holds a fixed plenum pressure via a separate valve, so more of the shots in a fill share the same extreme spread. Many higher-end platforms in this range, such as the FX Impact M4, ship regulated as standard; several others accept an aftermarket external regulator.

How many shots do I get from one fill on a PCP air rifle?

Total shot count depends on reservoir size, calibre and power level, and varies by model, so we do not quote a single figure here. What matters more than the total is how many of those shots fall within the rifle’s consistent “sweet spot” or, on a regulated rifle, within the regulator’s set pressure range; check the individual product page for the manufacturer’s stated figures.

How do I refill a PCP air rifle?

The three common routes are a hand pump, a carbon fibre or steel dive bottle, or an HPA compressor. A hand pump is cheapest but hard work above 200 bar; a bottle refills in seconds but needs refilling itself; a compressor removes the refill errand entirely. Never fill above the pressure stamped on the cylinder, and always use clean, dry air, since moisture is the main cause of valve and regulator corrosion.

What is the difference between a bottle rifle and one with an internal reservoir?

A bottle rifle uses a removable, often carbon fibre, air cylinder that screws into the action, so you can swap in a spare bottle in the field. A rifle with an internal reservoir, sometimes called a buddy bottle format when a second cylinder doubles as a shoulder stock, keeps the air supply built into the rifle itself. Bottle rifles are typically easier to top up mid-session; internal reservoir rifles are usually more compact.

Which calibre should I choose for a PCP air rifle?

.22/5.5 mm and .25/6.35 mm are the most widely stocked calibres in this range and suit target shooting, pest control and general all-round use. .177/4.5 mm gives the flattest trajectory for target work. .30/7.62 mm and up move into slugs and bigger bore territory, where retained energy matters more than pellet cost. If you are unsure, .22 remains the most common starting point for a first PCP rifle.