4UAD 4UANTUM Magnus Pro Hop-Up Chamber, APFG MCX GBB Series
The 4UAD 4UANTUM Magnus Pro is a precision-machined TDC hop-up chamber designed for the APFG MCX GBB series. Its one-piece 6061 aluminum construction, true vertical hop-up adjustment and self-centering inner barrel mount are designed to improve shot consistency and the rigidity of the barrel assembly.
Magnus Pro combines precise hop-up adjustment with a redesigned mechanical structure. The chamber helps keep the inner barrel and hop-up contact point correctly aligned while reducing stress on the loading nozzle during cycling.
True TDC Hop-Up Adjustment
The true TDC (Top Dead Center) mechanism applies pressure to the hop-up bucking directly from above. Keeping the pressure point centered helps produce consistent backspin and reduces the possibility of unwanted sideways deviation.
The adjustment wheel is accessible through the openings in the handguard. This allows fine-tuning the hop-up without disassembling the rifle or using a dedicated adjustment tool.
Self-Centering Inner Barrel Mount
Magnus Pro features a self-centering three-point inner barrel locking system. The design holds the inner barrel securely in position, helping maintain consistent alignment between the barrel and hop-up chamber.
The housing is CNC-machined from a single billet of 6061 aluminum. Since the hop-up chamber also forms part of the barrel-mounting interface on the APFG MCX platform, its rigid construction helps support the entire barrel assembly.
Optimized Cycling Geometry
The chamber features revised contact geometry that allows it to interface with the bolt carrier rather than receiving repeated impacts directly from the loading nozzle. This helps reduce the risk of nozzle damage during operation.
Recommended Hop-Up Bucking
We recommend pairing the Magnus Pro hop-up chamber with the 4UAD 4UANTUM Friction Pro High Performance GBB Bucking. Its centered contact patch complements the Magnus Pro's vertical TDC adjustment and precise bucking alignment, helping produce consistent backspin.
Compatibility
- APFG MCX Rattler GBB
- APFG MCX Legacy GBB
- APFG MCX SPEAR LT GBB
- APFG MCX Rattler LT GBB
- APFG MCX RSAR GBB
- APFG MCX SURG GBB
- APFG MCX HUNTER GBB
- Other compatible APFG MCX GBB series models
- BPW MCX GBB models using the APFG MCX GBB system
Compatibility limitations: This chamber is not compatible with APFG MPX GBB, APFG XM7 (SPEAR) GBB or MCX GBB rifles from other manufacturers. Japanese-specification GBB inner barrels may also have incompatible mounting slots. The manufacturer specifically excludes PDI, KM and LayLax inner barrels of this specification.
Technical Specifications
- Manufacturer: 4UAD
- Product Series: 4UANTUM
- Model: Magnus Pro MCX
- Product Code: 4UAD-TDC-005
- Type: TDC hop-up chamber
- Compatibility: APFG MCX GBB series and compatible BPW MCX GBB models
- Material: CNC-machined 6061 aluminum
- Hop-Up Adjustment: True vertical TDC
- Inner Barrel Mount: Self-centering three-point locking system
- Adjustment Access: Through the handguard openings
Not Included
- Hop-up bucking
- Inner barrel
Manufacturer's Installation Guide and Videos
