In this brief video, Airsoft Mechanic GR showcases a customised G&P M4. The base gun for this customization is the G&P M4 itself, which has been enhanced with several upgrades. These include the BTC SPECTRE MK1, TINLEY 25K, and the Lonex spiral bevel+pinion. Furthermore, a 13:1 (SS - 3) has also been added to the mix, contributing to the overall performance of the customised AEG.