Prime Mech Airsoft has expressed satisfaction with the sound of the MK18 AEG, which operates at 1.5j. This is attributed to a custom build that incorporates several components. The base rifle used is the Specna Arms SA-E19 SA-E26, which is complemented by the M4A1 CQBR Mod1. The build also features the Daniel Defense MK18 RIS II, which enhances its functionality. Additional accessories include the EXPS3 Hollywarrior, the LA5 laser, and the Surefire M600, all of which contribute to the overall performance and efficiency of the custom build.