Custom upper receiver designed for the AAP-01, inspired by the Fuku-2 style

✅ Fully functional design

🧱 FDM-optimized geometry for reliable printing

📏 Tuned tolerances for proper fit and reduced wobble

🎯 You must use the original AAP-01 rear sight

➕ Extended top rail

🧩 Easy assembly

⚙️ Compatibility

Designed for: AAP-01 (Action Army)

Compatible with: V2 compatible with firewad M4 lower

Tracers (threaded front)

Stock internal components