TTI AAP-01 Scorpion Upper Receiver Kit – Carbon

The TTI AAP-01 Scorpion Upper Receiver Kit is a performance-focused upgrade component designed for Sig MPX platform builds. Featuring a complete upper assembly with factory-matched tolerances, this kit combines robust construction with practical ergonomics for serious skirmishers and milsim players.

Key Features

• TDC hop-up system – accessible via the mock ejection port dust cover for field-adjustable accuracy
• V2 gearbox – proven reliability and compatibility with standard upgrade parts
• Aluminium construction – handguard, outer barrel, muzzle device and buffer tube for durability
• M-LOK rail integration – 20mm Picatinny railed receiver for flexible optics and accessory mounting
• Multi-position sliding stock – 1913/20mm Picatinny attachment interface for adjustable length-of-pull
• 345 fps performance – consistent velocity with 0.20g BBs and safe semi/full automatic firing modes
• 100-round magazine capacity – King Arms MPX-K Sportline compatible (VFC/Sig Air magazines not supported)

Real-World Use Cases

Ideal for CQB skirmishers and indoor milsim players who need a compact, manoeuvrable platform. The upper receiver kit works with existing lower assemblies, making it a cost-effective path to upgrading Sig MPX platforms. The adjustable stock and rail system accommodate varying playstyles, from snapshot engagements to sustained suppression roles.

Technical Specifications

• Velocity: Approximately 345 fps (± 10%) using 0.20g BBs
• Inner barrel length: 16 inches
• Overall length: 81 cm (stock dependent)
• Weight: Approximately 2.493 kg
• Gearbox: V2
• Motor: Standard
• Battery: 7.4V LiPo compatible
• Firing modes: Safe, semi-automatic, full automatic
• Magazine capacity: Approximately 100 rounds
• Rail system: 20mm Picatinny railed receiver, M-LOK handguard slots
• Construction: Aluminium (handguard, barrel, muzzle device, buffer tube); high-density polymer (receiver, grip, magazine well, stock)

Compatibility & Upgrades

This kit is engineered for Sig MPX PCC platforms. It accepts King Arms MPX-K Sportline AEG magazines; note that Sig Air and VFC MPX AEG magazines are not compatible. The V2 gearbox supports standard upgrade springs, pistons, and shims for performance tuning. The M-LOK handguard and Picatinny rail interfaces accommodate aftermarket grips, lasers, lights, and optics mounts.

UK Legal & Site Notes

This upper receiver kit complies with UK airsoft regulations (two-part construction, metal body, 345 fps safe for most outdoor sites). Chronograph your assembled rifle before deployment—site limits typically range from 350–450 fps for two-handed weapons. Always use eye protection and confirm magazine compatibility at your venue, as King Arms magazines may not be universal across all Sig MPX builds.

The TTI AAP-01 Scorpion is an excellent foundation for customisation. Shop accessories, springs, and rail components at Airsoft Direct to perfect your build.