In this video, Stupid Airsoft checks out a custom lower for the Action Army AAP-01 made by King Slayer. He starts by detailing the King Slayer Grip, including its construction from ASA plastic with 100% infill, before demonstrating the installation of the hardware and fitment test. Key design features noticed are the trigger adjustment slot and the various grip panels and comfort options. He also examines the addition of a magwell flare and compares the assembly to the stock lower.

From there, he moves to a live firing demonstration, setting up the AAP-01 with the new lower and a drum magazine for both semi-auto and full-auto firing tests. Following the shooting, he offers a detailed performance analysis and discusses the durability and interchangeable grip features.