The Sol Invictus is the most versatile custom AAP-01 from the Custom Lab BDU. It combines HPA (High-Pressure Air) power with a CTM Maximus kit that accepts M4 magazines: you go from the 25 rounds of a Glock magazine to 120-300 BB magazines, without constant reloading in the middle of a game.

Why HPA is a game-changer

Unlike green gas, compressed air maintains stable power regardless of temperature: no FPS drop in the cold, no performance drop during prolonged bursts. The line regulator allows you to adjust the power directly on the field.

The Maximus kit: capacity and comfort

The M4 lower of the Maximus kit accepts most M4 magazines on the market (mid-cap, high-cap, or even drum), which simplifies reloading and sharing BBs with teammates using AEGs. The assembly remains reversible: you can return to the original pistol configuration without permanent modification.

Included components:

• Action Army AAP-01 base, black, reinforced polymer.
• CTM Tactical Advanced V2 gold bolt, 7075 aluminum, 27.5g, skeletonized.
• FUKU-2 CNC Set V2 upper, 6061 aluminum.
• FUKU-2 CNC compensator for recoil control.
• REAPER gold side grip, aluminum.
• CTM Maximus HPA kit: M4 lower + magazine HPA valve (external line).
• CTM 200% nozzle spring and CTM 160% recoil spring.
• Complete TTI hammer kit, anti-breakage.

Compatible options:

• Maple Leaf Decepticon 60° hop-up bucking.
• Nexxspeed or Action Army hop-up unit.

HPA equipment to be provided (not included):

• Certified compressed air tank (13ci or 48ci).
• Line regulator to adjust pressure.
• High-pressure macro line.
• Additional M4 magazines as needed.

A reliable HPA assembly

Installing an HPA line and a Maximus kit requires precise adjustments (nozzle alignment, valve sealing): an approximate assembly causes leaks and inconsistency. The Sol Invictus arrives assembled, adjusted, and tested, ready to connect your line and play. Our Custom Lab methodologydetails each step of this preparation.

Other AAP-01 Custom BDU builds

The Sol Invictus is our most complete build in terms of capacity and performance. For discretion, the Tenebraefeatures an iridescent finish; the Impériumaims for pure rate of fire in gas configuration; the Rubicondisplays a red Speedsoft signature; and the Argentumis the compact silver CQB choice. Compare all builds on the Custom Lab BDU page.

HPA requires specific maintenance: our customization guidedetails the magazine valve and Maximus kit, the maintenance guidecovers line and regulator checks. Also consult our articles on degassing, the full-auto bug, the broken hammer, and hop-up adjustmentaccording to your BBs.