The Airtech Studios TDC Bracket Converter Kit for VFC Rotary Hop‑up Chambers (including VFC M4 & Sig Sauer MCX Virtus Series) is an advanced upgrade part designed to improve hop‑up performance for airsoft AEG rifles. This conversion kit enables a Top‑Down‑Centre (TDC) hop‑up force application using a trolley‑style system, delivering more consistent pressure to your R‑Hop or Flat‑Hop setup for tighter groups and increased range.
 
Key Features
TDC (Top‑Down‑Centre) Conversion: Replaces or augments the standard rotary hop‑up arm with a TDC bracket system that applies hop pressure straight down onto the bucking and BB. This optimized force application improves accuracy and shot‑to‑shot consistency, especially with R‑Hop or Flat‑Hop setups.
Enhanced R‑Hop/Flat‑Hop Compatibility: Designed to work with R‑Hop patches (e.g., Elvish, Psionic, Silent Sniper) and Flat‑Hop buckings such as Maple Leaf MR, Super Macaron, or Super Silicone, helping you achieve deeper hop engagement and stable backspin.
Precision Guided Trolley System: Includes a guided trolley and bracket assembly that restricts movement to the vertical axis, ensuring consistent pressure across the hop patch and pushing the patch evenly for enhanced BB spin.
Improved Accuracy & Consistency: The TDC system’s top‑down force application helps reduce hop variation and improve accuracy over longer distances — ideal for DMR builds or precision‑oriented setups.
Installation & Modification: Designed specifically for VFC rotary hop‑up chambers such as those found in the Virtus MCX and similar platform systems. Some modification of the outer barrel or barrel holder may be required for proper fitment; full instructions are included in the installation manual.