SA TDC Magnus™ M4 Hop-Unit Unit and Helium™ Flat Bucking - Black

Specna Arms TDC Magnus™ M4 Chamber

Want to increase the accuracy of your AEG M4? Looking for a chamber that provides a stronger and more stable pressure even with heavier BBs? Trying to eliminate the issue of curving shots and get consistent backspin? The TDC Magnus™ hop-up chamber paired with the Helium™ Flat bucking is exactly what your rifle needs. TDC pressure acts vertically and directly above the barrel window, removing inaccuracies typical of standard lever-based systems. The Flat bucking, thanks to its smooth internal surface, ensures a wider contact patch, stronger backspin, longer range and excellent accuracy.

Example of assembled chamber (inner barrel not included)

Key Features

• TDC pressure:
  Vertical pressure from above – no levers at odd angles, just maximum accuracy.
  
  
• Helium™ Flat bucking:
  Nubless design with a wide contact surface for strong and stable backspin.
  
  
• Improved range and accuracy:
  Ideal for heavier BBs (0.30+ g).
  
  
• Nylon:
  Durable, lightweight chamber resistant to rough handling.
  
  
• M4 / AR15 compatibility:
  Designed for most AR15 AEG platforms.

Technical Specifications

• Chamber material: Nylon
• For rifles: M4 / AR15 AEG
• Pressure type: TDC (vertical top-down pressure)
• Bucking type: AEG Flat

Package Contents:

• Complete Magnus™ M4 hop-up chamber
• Helium™ Flat hop-up bucking