English Français Deutsch Español Italiano
Log in to your customer account
0
Your cart ×
Unfortunately your basket is empty
Menu

Gases in Airsoft, what are PSI?

Gases in Airsoft, what are PSI?

What Is PSI in Airsoft?

In Airsoft, gas is used to operate certain replicas. There are several types of airsoft gas bottles, each with recommended operating temperatures and a different PSI rating.

But what exactly is PSI?

Definition: PSI (Pounds per Square Inch) is an Anglo-Saxon unit of pressure. It should not be confused with the Pascal (Pa), the unit used in the International System of Units.

To put it simply, PSI measures the pressure of the gas inside the bottle. The higher the PSI, the higher the pressure available to propel the BB, which can result in increased muzzle velocity (FPS).

WARNING! Some airsoft replicas cannot withstand high-PSI gases. Always check your replica's compatibility before using a higher-pressure gas.

Which Gas Should You Choose for Your Airsoft Replica's Slide?

• Plastic slide (Marui, etc.): Low-pressure gas recommended (110 to 120 PSI) to avoid cracking the slide.

• Standard metal slide: Versatile medium-pressure gas (130 to 145 PSI), ideal for most GBB airsoft pistols.

• Heavy replicas / GBBRs: High-pressure gas (150 PSI and above) to cycle heavy slides or for use in cold weather.

Dry Gas or Silicone Oil Gas: What Are the Differences?

• Silicone gas (Occasional use / Storage): It contains lubricant that helps protect your magazine seals and prevents them from drying out and leaking. Its use should remain occasional (for example, at the end of the day or when using the last magazine of a game) or be reserved for long-term storage of your magazines under pressure.

• Dry gas (Regular use / Performance): Unlike raw propane, this is a gas formulated for airsoft that contains no added silicone oil, helping to keep the Hop-up completely clean and ensure a consistent trajectory. However, its composition retains a tiny amount of neutral technical lubricant to prevent your valves from drying out immediately. Regular manual maintenance of your magazines after games is still essential.

The Impact of Temperature on Airsoft Gas

❄️ The Impact of Temperature: Why Doesn't Airsoft Gas Like Winter?

Airsoft gas is extremely sensitive to temperature fluctuations due to a physical phenomenon known as the cooling effect (or cool-down effect). When you fire in bursts or shoot rapidly in succession, the gas transitions from a liquid to a gaseous state inside the magazine. This physical process consumes energy and causes the temperature of your magazine to drop sharply.

In winter (below 15°C): Since the outdoor temperature is already low, the magazine cools down rapidly. The internal pressure drops, the slide no longer has enough force to cycle properly, and gas may escape all at once through the barrel. This is known as gas venting.

In summer (above 25°C): Conversely, heat increases the gas pressure inside the bottle and magazine. Your replica may shoot at a much higher velocity (increased FPS) and experience greater mechanical stress with every shot.

💡 Our Tips for Choosing the Right PSI for Each Season

To maintain consistent performance throughout the year without damaging your replica, you should adapt your gas pressure (PSI) to the outdoor temperature:

In winter (low temperatures): You may need a higher-pressure gas. If you normally use 120 or 130 PSI in milder weather, consider a 150 PSI gas (such as Nuprol 3.0 Red) to compensate for the pressure loss caused by the cold and help your slide complete its cycle. Always check your replica's compatibility with high-pressure gas.

In summer (high temperatures): Use a lower-pressure gas when appropriate. To protect your pistol's mechanics and stay within your site's power limits, consider a lighter gas rated at 110 or 120 PSI (such as Swiss Arms Light or Nuprol 1.0 Blue). Always chronograph your replica under the conditions in which you will be playing.