Mister Duffo tests the performance of a gas blowback airsoft rifle, specifically the Tokyo Marui AKX, in freezing conditions. The experiment takes place outdoors at a temperature of -6 degrees Celsius. The goal is to compare how different types of gas and magazine storage temperatures affect the gun's firing consistency and power output.

He evaluates two types of gas: Nimrod Black and ESG Red. He compares magazines that have been kept in external pouches at ambient cold temperatures with those kept inside his clothing to maintain body warmth. Initial measurements show that the "cold" magazines sit around 6 degrees Celsius, while the "warm" magazines are significantly higher at over 17 degrees Celsius.

During the firing sequences, the performance of the cold magazines shows a predictable decline. With red gas, the power starts at 1.45 joules but drops as the magazine temperature falls toward zero, leading to a slower bolt cycle and reduced snappiness. The black gas proves more resilient in the cold, maintaining functional range and power even as the magazine temperature reaches the freezing point.

He says that keeping magazines close to the body is the most effective way to ensure reliable performance in winter environments. While both gases remain usable, the black gas offers more stability under these conditions. The rifle itself remains functional throughout the test, though the speed of the system slows down as the hardware absorbs the ambient cold.