AEX Custom Death Adder  AAP-01 HPA, FDE / Black

Your sidearm just became your primary.

This isn’t your average AAP-01. Built from the ground up for performance, durability, and straight-up style, this custom HPA-powered Action Army AAP-01 Assassin is ready to dominate the field. Finished in Flat Dark Earth and accented with premium black CNC upgrades, this build brings together the best of CTM TAC, Action Army, and PTS for a pistol that hits harder, cycles faster, and feels cleaner than anything else out there.

 Key Features:

• Action Army AAP-01 Assassin (FDE) – A legendary green gas pistol base, fully compatible with both semi and full-auto fire modes. Reliable, lightweight, and highly upgradable.

• CTM Maximus HPA Frame Conversion Kit (FDE) – The heart of this HPA build. Seamlessly adapts your AAP-01 to HPA setups with full M4 stock and grip compatibility. Designed for aggressive maneuvering and enhanced control.

• CTM TAC FUKU-2 Shark CNC Upper (Black) – A slick, ventilated aluminum upper that adds precision CNC machining and a modern aesthetic. Perfect for faster cycling and a tighter feel.

• CTM TAC FUKU-2 CNC Magazine Release (Black) – Oversized, high-response mag release for quick reloads under pressure.

• CTM TAC FUKU-2 Aero CNC Side Panels (Black) – Lightweight side upgrades to match the Shark upper, reinforcing the frame while adding a tactical edge.

• CTM 160% Non-Linear Recoil Spring – Increased recoil resistance for snappier response and better cycle timing—ideal for high-speed setups.

• Action Army Steel Hammer – Reinforced internals for durability and consistent performance, even in full-auto HPA abuse.

• PTS EPM1-S 170rd AEG Midcap Magazine (FDE) – Sleek, compact, and crazy high-capacity for a mag this short. PTS reliability ensures smooth feeding every time.

The M4XIMUS Kit – HPA Redefined

Let’s talk about what makes this build next-level: the CTM Maximus HPA Frame Conversion Kit, affectionately dubbed the M4XIMUS. This isn't just a frame swap—it's a complete evolution of the AAP-01 platform. With integrated M4 buffer tube and grip compatibility, you can now run full rifle ergonomics on a pistol-sized platform. The M4XIMUS delivers unmatched control, improved shoulder stabilization, and opens up endless customization potential with AR-compatible stocks and grips.

The solid Tan polymer and CNC aluminum reinforcements make it rugged, field-worthy, and absolutely killer in terms of style. Whether you're running CQB or looking for a sleek secondary that feels like a primary, the M4XIMUS frame is what makes it possible.

 Ideal For:

• Speedsoft and CQB players who want rifle-level performance in a compact package

• HPA users looking for a slick, highly customizable platform

• Players who love full-auto mayhem with consistent performance

This custom AAP-01 HPA build is more than a sidearm—it's a statement. Lock it in, plug it into your tank, and let the M4XIMUS dominate.

Specifications

Overall Length: 10" (stock collapsed) 
Weight: 2 pounds (with magazine)
Inner Barrel Length:  129mm
Firing Mode: Semi-Automatic, Automatic
Magazine Capacity: 175
Power Source: HPA
Hop-Up: Adjustable