L'Antre Du Dingo looks into improving the Tokyo Marui M4 and HK416 NGRS with the Airtech TDC (Top Dead Centre) Trolley Converter. Airtech claims that this improves accuracy and consistency for sniper DMR builds by applying consistent downwards pressure onto the BB with a longer patch. It works perfectly with R-Hop and Flat-hop setups and installs onto the stock hop chamber, retaining standard adjustment functionality and preventing misfeeding or double feeding.