4UAD - 4UANTUM Magnus Pro 2011 TDC Hop up Chamber for TM Hi-Capa / 1911 GBB PistolThis hop up unit is designed for Tokyo Marui spec Hi Capa and 1911 GBB Airsoft pistol series. Machined from solid 7075 aluminum billet, the Magnus Pro 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 pistol's potential with adjustable pitch &