The 4UAD ? 4UANTUM ?Magnus Pro? TDC Hop-Up Chamber Set is a precision upgrade designed for the APFG MCX GBB Airsoft Rifle Series, with compatibility listed for the APFG MCX GBB Airsoft Rifle Series and application to the APFG MCX / Spear LT GBB series. Precision-machined from a single block of 6061 billet aluminum, the Magnus Pro brings serious mechanical improvements to the APFG MCX GBB platform. Its rock-solid one-piece housing uses a patented center locking system with a self-centering tri-lug inner barrel lock, along with a hop-up bucking shroud for precise bucking alignment, helping to dramatically tighten shot groups and improve consistency. The chamber also features true Top-Dead-Center, or TDC, articulation and quick hop-up adjustment, allowing users to dial in their hop setting with greater precision and convenience.

Beyond raw accuracy, 4UANTUM has re-engineered the cycling geometry so that the chamber catches the bolt carrier rather than the loading nozzle, sparing the nozzle from destructive, repetitive impacts. Because the APFG MCX relies on the hop-up unit as part of its barrel assembly, the ultra-rigid Magnus Pro housing also stiffens the entire front end of the rifle. Best of all, the hop setting can be fine-tuned on the fly using a slim tool through the handguard?s M-LOK slots, completely eliminating the hassle of field teardowns. The chamber is a simple drop-in installation, but it requires DIY technical knowledge to ensure proper fitment and function. Overall, the 4UANTUM Magnus Pro TDC Hop-Up Chamber Set combines precision machining, improved cycling durability, easier adjustment, and a rigid one-piece design to deliver a meaningful performance upgrade for the APFG MCX GBB Airsoft Rifle Series.

Key Features

• The 4UAD ? 4UANTUM ?Magnus Pro? TDC Hop-Up Chamber Set is designed for the APFG MCX / Spear LT GBB series.

• It is precision-machined from a single block of 6061 billet aluminum with a rigid one-piece housing.

• A patented center locking system and self-centering tri-lug barrel lock improve stability and alignment.

• The Hop-Up Bucking Shroud ensures precise bucking alignment for tighter groups and better consistency.

• True TDC articulation and quick hop-up adjustment allow precise, convenient tuning.

• Re-engineered cycling geometry catches the bolt carrier instead of the loading nozzle, reducing nozzle impact damage.

• The rigid housing also stiffens the APFG MCX front end because the hop-up unit is part of the barrel assembly.

• Hop can be adjusted on the fly through M-LOK slots with a slim tool, avoiding field teardowns.

• Installation is drop-in, but requires DIY technical knowledge for proper fitment and function.