Survival JP introduces the updated Essential G custom series (versions 2.0 to 2.1) designed for GHK CO2 gas blowback rifles. It begins with a demonstration showing the rifle hitting targets at distances of 20 and 40 meters. He notes that continuous firing causes a slight drop in gas temperature and velocity, which may require minor aiming adjustments, but highlights that the overall accuracy remains solid.

The main upgrade involves an original custom chamber developed to resolve a common issue with overseas airsoft guns. Because these models are initially built for heavier BBs used in foreign markets, using lighter Japanese BBs often creates a gap that leads to unstable hop-up rotation. The new custom chamber eliminates this gap, ensuring consistent positioning and stable flight paths even with lighter ammunition.

As the series progresses to versions 2.0 and 2.1, additional features are included, such as high-precision stainless steel inner barrels, enhanced recoil processing, and fine-tuned buffer springs. The advanced 2.1 version introduces an adjustable velocity feature using interchangeable internal screws, allowing users to adapt the rifle's power to changing weather and temperatures. Survival JP keeps some internal mechanical secrets closely guarded, relying on word-of-mouth and performance results rather than a detailed parts list to convince buyers.