4UAD Smart Airsoft has been conducting a series of experiments to determine the impact of various configurations on the accuracy of gas blowbacks. One of the key areas of focus has been the inner barrel and bucking. They have specifically used Unicorn Bucking and Unicorn Barrels in their tests. The quality of a barrel is crucial in these experiments, and there are certain criteria to assess if a barrel is good. Another significant component in their setup is the Unicorn TDC Hop-up Chamber. All of these done on a VFC G45 GBB pistol. A shooting test was conducted to evaluate the performance and accuracy of the setup. The overall feedback and conclusion drawn from these experiments have been insightful, shedding light on the intricate dynamics of gas blowback configurations.