Firing Marius has upgraded his Archwick B&T Air APC9K with several enhancements and accessories. He measured the performance using Specna Arms Core 0.20g BBs and a chronograph, noting that with Nimrod green gas, the power increased by approximately 19 m/s. The internal upgrades include a Maple Leaf Crazy Jet 180mm/6.04mm barrel and the original hop-up rubber, as a Maple Leaf hop-up rubber did not fit.