When we first picked up the AAP-01, we saw more than a pistol.
We saw potential — a blank canvas waiting for players to leave their mark.
Over the years, the AAP-01 community has built, tuned, and modified every corner of the platform.
But one piece defines the soul of any build: the lower receiver.
And that’s where the Kingslayer Lower was born.
The Underdog Story
The name Kingslayer isn’t about taking a throne — it’s about earning it.
This project started the same way Jefe Airsoft did: from a workbench, built by players who believed the AAP-01 could evolve beyond factory limits.
Every curve, cut, and tolerance in this lower was designed for those who build, test, and rebuild until perfection hits.
It’s a symbol of rebellion against cookie-cutter builds and overpriced copies — but right now, it’s also an open prototype, and we want your feedback to make it even better.
Designed by Players, Refined by Players
The Kingslayer Lower Receiver Prototype brings modularity and experimentation to the next level.
It embodies everything the People’s Platform stands for — freedom, creativity, and collaboration.
Key Features
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🧩 Modular Grip System – Removable side panels so you can tweak ergonomics or aesthetics.
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🧱 Ergonomic Geometry – Balanced angles for improved handling and control.
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💪 3D-Printable Design – Available now as a prototype file, giving players the chance to shape the future of the platform.
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⚒️ AAP-01 Compatibility – Fits stock internals while opening doors for custom conversions.
This release isn’t final — it’s an invitation to help refine the future of the AAP-01.
Prototype File Available Now
The Kingslayer Lower Receiver Prototype is now available exclusively through our site:
👉 Download the Kingslayer Lower Prototype Here
Download it. Print it. Test it. Then tell us what works — and what doesn’t.
We’re collecting community feedback to adjust tolerances, ergonomics, and assembly flow before the production version drops.
Tag @jefe_airsoft when you post your results — your input directly shapes the final design.
Every King Falls — But the Underdog Rises
The Kingslayer Lower is more than a part.
It’s a movement built by the players who keep innovating long after the meta says “done.”
Every king falls eventually.
But the underdog? He keeps building.
Recommended Upgrades
JAS-017 Complete Spring Set for AAP-01
TTI Full Stainless Hammer Set
Complementary Installation Service