4UANTUM APFG MCX GBB Series MAGNUS PRO TDC Hop-up Unit

4UANTUM MAGNUS PRO precision TDC hop-up unit for APFG MCX GBB

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are bound to the anareus.cz domain.MAGNUS PRO MCX from the Taiwanese brand 4UANTUM is a completely redesigned hop-up unit for APFG MCX GBB Series gas rifles, developed with an emphasis on accuracy, shot-to-shot consistency and mechanical durability. At its core is a one-piece body CNC machined from a single block of 6061 aluminium. The unit uses a true TDC (Top Dead Center) pressure system, which applies pressure to the hop-up bucking directly from above and helps ensure even pressure without unwanted lateral deflection. The patented self-centring inner barrel mounting system helps keep the barrel and bucking precisely aligned in the correct position. 4UANTUM has also modified the unit geometry in relation to the bolt cycle. During operation, the unit interacts with the bolt rather than transferring repeated impacts to the loading nozzle, helping to reduce the risk of nozzle damage. On the APFG MCX platform, the hop-up unit is also part of the barrel mounting system, so the stronger one-piece MAGNUS PRO construction contributes to greater rigidity of the entire barrel assembly. Hop-up adjustment is handled by a practical adjustment wheel that can be accessed through the handguard openings or an M-LOK slot, allowing fine adjustments to be made directly on the rifle without disassembly. Installation requires appropriate technical experience, and the unit is supplied without an inner barrel or hop-up bucking. We recommend purchasing the 4UANTUM Friction GBB hop-up bucking.

Key features of the MAGNUS PRO MCX GBB hop-up unit

Technical specifications

• Manufacturer: 4UANTUM / 4UAD
• Model: MAGNUS PRO MCX
• Designed for: APFG MCX GBB Series
• Body material: CNC-machined 6061 aluminium
• Other materials: Steel, rubber
• Pressure system: True TDC (Top Dead Center)
• Barrel mounting: Self-centring Center Lock system
• Hop-up adjustment: Adjustment wheel accessible through the handguard
• Compatibility: APFG MCX Rattler, Legacy, SPEAR LT, Rattler LT, RSAR, SURG and MCX HUNTER
• Additional compatibility: BPW MCX GBB using the APFG MCX GBB system
• Made in: Taiwan

Package contents

• 4UANTUM MAGNUS PRO MCX TDC hop-up unit
• 2 pressure options

Frequently asked questions from our store

Which APFG MCX models are compatible with the MAGNUS PRO?

The unit is designed for the APFG MCX GBB Series, specifically the Rattler, Legacy, SPEAR LT, Rattler LT, RSAR, SURG and MCX HUNTER models. It can also be used with BPW MCX GBB rifles based on the APFG MCX system.

Does the unit also fit the APFG MPX or XM7 SPEAR?

No. Both the APFG MPX GBB and APFG XM7 (SPEAR) GBB use a different hop-up system design. The MAGNUS PRO MCX is also not designed for MCX GBB rifles from other manufacturers or other GBB platforms.

Which inner barrels can be used with the unit?

An inner barrel compatible with the APFG MCX GBB system design must be used. The manufacturer notes that Japanese-spec barrels may use different grooves and dimensions and may not be compatible without additional modifications. It specifically states that PDI, KM and LayLax barrels of this specification are incompatible.