THE BLACK KNIGHT – Custom HPA AAP-01

The BLACK KNIGHT is a fully customized HPA-powered Action Army AAP-01 that blends cutting-edge performance parts with aggressive styling to deliver a sidearm—or even a primary—that dominates on the field. Built for competitive airsoft players who demand reliability, precision, and speed, this build leverages a mix of CTM, Action Army, Maple Leaf, and other premium components to push the AAP-01 platform to its true potential.

Build Quality & Components

• Action Army AAP-01 Assassin (Blk)
  Starting with the tried-and-true AAP-01 Assassin, this custom build transforms the platform from a reliable green gas sidearm into a finely tuned HPA-driven beast.

• Maple Leaf 2023 MR Hop Silicone Bucking (60°) + Maple Leaf 6.02mm GBB Inner Barrel (229mm)
  These upgrades provide pinpoint accuracy with excellent air seal and consistency shot after shot. The MR Hop bucking is designed to grab BBs securely, giving excellent lift for heavy-weight ammo.

• PTS EPM1-S 170rd Midcap Magazine
  A staple for competitive players, this magazine ensures you won’t run dry in the middle of a push. Feeding is smooth, and its compact size balances perfectly with the folding stock configuration.

• Acetech Blaster C Tracer Unit (Black)
  Not only does this tracer unit light up your BBs, it also adds a sleek, aggressive look to the build. Perfect for low-light CQB environments.

• CTM TAC AAP-01 7075 Advanced Lightweight Charging Handle (Black)
  An ergonomic and lightweight upgrade that makes manipulation quick and easy, perfect for speed reloads or racking the slide under stress.

• Action Army Steel Hammer & CTM AAP-01 180% Recoil/Nozzle Spring Set
  Durability and responsiveness are the main takeaways here. The steel hammer guarantees long-term reliability under HPA pressure, while the upgraded springs add a snappy, fast recoil cycle.

• AEX Riser Mount + SRO Dot Sight with Tactical Latch (Black)
  Target acquisition is seamless with this setup. The riser ensures proper alignment, while the SRO red dot provides a wide field of view for rapid transitions between targets.

• Action Army AAP-01 M-LOK Handguard & Folding Stock
  These external upgrades not only make the BLACK KNIGHT feel like a compact SMG but also improve stability and handling for aggressive, run-and-gun playstyles.

• CTM TAC FUKU-2 Aero CNC Side Panels (Black)
  A cosmetic yet functional addition, these panels give the BLACK KNIGHT a distinct futuristic look while keeping the build lightweight and streamlined.

The Maximus Kit – The Core of the Build

At the heart of THE BLACK KNIGHT is the CTM Maximus HPA Frame Conversion Kit. This kit is what truly transforms the AAP-01 into a competitive powerhouse. By replacing the traditional pistol frame with a dedicated HPA-ready system, the Maximus kit allows seamless integration with HPA regulators and lines, offering unmatched shot consistency and efficiency compared to standard green gas setups.

The blacked-out Maximus kit not only matches the aggressive aesthetic but also provides:

• Full HPA Compatibility – Reliable air delivery with no cooldown issues.

• Durability – CNC aluminum and reinforced design built for tournament-level play.

• Ergonomics – Enhanced grip and frame stability, giving the BLACK KNIGHT a rifle-like feel when paired with the folding stock.

• Competitive Advantage – With HPA consistency, the user gains tighter groupings, more stable FPS, and faster follow-up shots compared to gas-powered counterparts.

Simply put, without the Maximus kit, the BLACK KNIGHT wouldn’t reach the same level of precision and performance.

Field Performance

On the field, the BLACK KNIGHT feels more like a hybrid SMG than a pistol. The Maple Leaf internals provide top-tier accuracy, while the HPA system ensures every shot is consistent regardless of weather conditions. The folding stock stabilizes shots during longer engagements, and the M-LOK handguard allows the addition of tactical accessories if needed. With the Acetech tracer and SRO optic, target tracking and visibility are exceptional even in dark CQB environments.

Final Verdict

The BLACK KNIGHT is a fully realized HPA custom that takes the Action Army AAP-01 far beyond its stock limitations. With the CTM Maximus kit at its core, premium Maple Leaf accuracy upgrades, rugged Action Army externals, and sleek tactical accessories, this build is ideal for competitive players who demand reliability and dominance in both CQB and outdoor play.

Brand: AEX Custom (Base by Action Army)
Model: AAP-01 Assassin GBB – THE BLACK KIGHT
Type: Gas Blowback Pistol (Converted for HPA)
Color: Black 
Material: CNC Aluminum / Polymer / Steel
System: HPA 
Hop-Up: Adjustable
Magazine Compatibility: AEG M4 Mags
Weight: Approx. 4.5 lbs
Firing Modes: Semi / Full Auto
Charging Style: Side Charging Handle (black)
BB Type: 6mm
Tracer Compatibility: Yes