NUPROL Airsoft Gas 300g (4.0 (Heavy Bolt))

Ultra-high-pressure 300g airsoft gas built for heavy bolt GBB rifles and high-mass operating systems requiring maximum driving force.

Product Features:

• 4.0 ultra-high-pressure performance grade
• 300g full-size cylinder
• Silicone-lubricated formulation
• Trace additive expansion system
• Optimised for heavy bolt rifles and DMR platforms
• Delivers maximum recoil impulse
• Stable cycling under extreme mechanical load
• Enhanced output for harsh or cold conditions

NUPROL 4.0 is the highest-pressure formulation in the NUPROL airsoft gas structure, developed for heavy bolt gas blowback rifles, DMR platforms and high-mass slide or bolt assemblies. Where standard or high-pressure gases may struggle to cycle reinforced or extended systems reliably, 4.0 delivers the maximum operating force required to maintain consistent mechanical function.

Heavy steel bolts, long-stroke systems and upgraded internal components increase resistance throughout the firing cycle. The 4.0 blend is engineered to overcome that resistance while maintaining controlled, predictable pressure behaviour. This results in strong recoil impulse and dependable cycling even under demanding conditions.

The formulation incorporates NUPROL’s highest-pressure trace additive expansion profile to promote rapid and stable gas expansion inside the magazine. Silicone lubrication supports seals and valves against the increased mechanical load, helping maintain operational consistency during extended use. For advanced GBB rifle setups that demand uncompromising power delivery, 4.0 provides the upper tier of the NUPROL pressure range.

Contents:

(x1) NUPROL Airsoft Gas (4.0-300g)

Range Overview:

The NUPROL Gas Range is the flagship New Propellant platform developed specifically for airsoft gas blowback performance. Built around a refined propane base and enhanced with a proprietary micro-dose trace additive expansion system, the range is engineered to deliver stable pressure output, predictable cycling and consistent FPS behaviour across a wide variety of replica types and environmental conditions.

Spanning low-power 1.0, balanced all-round 2.0, high-pressure 3.0 and ultra-high-pressure 4.0, the range supports everything from lightweight plastic-slide pistols to full-metal rifles and heavy bolt platforms. Each pressure grade is tuned to suit different mechanical loads, climates and performance requirements, allowing players and technicians to select a propellant that matches their platform rather than forcing a compromise.

Alongside the silicone-lubricated blends, the ZERO series provides silicone-free alternatives in 2.0, 3.0 and 4.0 pressure grades. These clean-running formulations are designed for users who prefer to manage lubrication manually, reducing internal oil residue and supporting precision-tuned hop units, tight-barrel systems and upgraded builds.

The portfolio also includes a compact 85g MINI format for field carry and quick top-ups, as well as a comprehensive Supply Pack containing multiple cans across the pressure spectrum for retail shelves, site fleets and workshop environments. Together, the NUPROL Gas Range delivers a complete, structured propellant system designed around realism, reliability and user-controlled performance.

• Flagship New Propellant range engineered specifically for airsoft GBB platforms
• Full pressure spectrum from low-power 1.0 through ultra-high-pressure 4.0
• Available in both silicone-lubricated and silicone-free ZERO formulations
• Micro-dose trace additive system for controlled expansion and pressure stability
• Consistent FPS behaviour and reliable cycling across varied climates
• Designed for pistols, SMGs, carbines, rifles and heavy bolt systems
• Options for lightweight slides, full-metal builds and high-mass rifle platforms
• Clean-running ZERO variants for precision-tuned and upgraded setups
• Formats from compact 85g field cans to full-size 300g cylinders
• Mixed Supply Pack available for complete retail and site stocking

Brand Statement:

NUPROL is a leading brand within the airsoft industry, delivering a comprehensive range of products covering consumables, replicas, attachments, and upgrades. Built on extensive industry knowledge and hands on experience, NUPROL focuses on practical design, consistent quality, and dependable performance. With a strong emphasis on reliability and usability, NUPROL products are developed to support airsoft players, retailers, and sites across all levels of the sport. From everyday essentials to advanced equipment, NUPROL continues to provide trusted solutions that perform where it matters most.

Safety Information:

This product is supplied in a pressurised container and contains flammable contents. Keep away from heat sources, sparks, open flames and hot surfaces. Do not pierce or burn the container, even when empty. Protect from direct sunlight and do not expose to temperatures above 50°C. Store out of reach of children and use only as directed.