Airsoft2Go shows how to replace a hop-up bucking in an airsoft gun, specifically demonstrating the process with the Friction Pro from 4UAD Quantum Industry. They cover key steps such as disassembling the airsoft gun, removing and disassembling the hop-up unit, replacing the hop-up bucking, cleaning the inner barrel, and reassembling the hop-up unit. It also emphasizes the importance of careful handling to avoid damaging components and mentions that the Quantum Friction Pro bucking is designed to maximize the patch surface for improved BB spin.