This airsoft build, performed by Prime Mech Airsoft in France, focuses on creating a high-end airsoft rifle characterized by the fastest and cleanest trigger response and the quietest AEG operation. The foundation for this custom rifle is a M4A1 CQBR SOPMOD Block 3 base gun in the Flat Dark Earth (FDE) / TAN edition, featuring an MK18 RIS III. The internal modifications for the MK18 Perfect Shimming Upgrade include a Gate ASTER II Bluetooth electronic trigger unit, a 28k brushless motor, an 18:1 sector gear (SSG) with a 12-tooth setup, resulting in a performance output of 1.2 Joules} when using 0.30g BBs.