4UANTUM MAGNUS PRO 2011 PRECISION MATCH GRADE TDC HOP CHAMBER (Hi-Capa/1911 GBBs)Machined from solid 7075 aluminium billet, The MagnusPro 2011 Hop Up chamber uses a true vertical TDC (Top Dead Center) movement. Which means, regardless of your hop up setting, the pressure point remains in the same position for consistent results. Featuring over 4 patented designs, the Magnus 2011 unlocks your GBB pistols potential with adjustable pitch & yaw for perfect barrel alignment. The side and frame take up screws remove all excess tolerance