Explosive Enterprises show the intricate process of building an "ultimate" custom airsoft M60 E3. Driven by a desire for a specific M60 variant, they acquired an old Inokatsu M60 E3 and undertook significant modifications to its outdated hop system, pistol grip, and dimensions, integrating parts from an A&K M60E4. The final custom M60 E3 boasts aluminum barrels, steel construction, and a manageable weight, capable of using A&K box mags and even a custom magneto-dynamic mag adapter for a loose belt.

Internally, it mirrors the performance of the A&K M60 E4. They chose the E3 variant for its historical significance as a "missing link" and its iconic appearances in 1980s action movies, culminating in what they proudly call their "Magnum Opus" of AEG machine guns.