Precision-machined from a single block of 6061 billet aluminum, the 4UANTUM Magnus Pro TDC Hop-Up Chamber brings serious mechanical upgrades to the APFG MCX GBB platform. Its rock-solid, one-piece housing utilizes a self-centering tri-lug barrel lock alongside a true Top-Dead-Center (TDC) adjustment system to dramatically tighten shot groups and boost consistency. Beyond raw accuracy, 4UANTUM re-engineered the cycling geometry so the chamber catches the bolt carrier rather than the loading nozzle, sparing your nozzle from destructive, repetitive impacts. Since the APFG MCX relies on the hop-up unit as part of its barrel assembly, this ultra-rigid housing also stiffens the entire front end. Best of all, you can fine-tune your hop setting on the fly using a slim tool through the handguard's M-LOK slots, completely eliminating the hassle of field teardowns. The hop-up chamber is a simple drop-in installation, but will require DIY technical knowledge to ensure proper fitment and function.
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