4UANTUM MAGNUS PRO AR HOP UP CHAMBER (GHK/VFC)

A must have upgrade if your standard VFC/GHK Hop unit is lacking that spice.

Please note: This hop chamber takes Finless/Wingless GBB spec buckings, if you want to pair with the 4UAD GBBR Bucking found here, you must cut off the alignment fin to fit.

From 4UAD:

Precision machined from solid 6061 aluminum billet, The MagnusPro Hop-Up chamber features 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. Revolutionary self-centering tri-lug locking is the most effective design at not only centering the inner barrel but also holding it firmly in place! CNC bucking sleeve precisely centers the orientation of hop up bucks and keep it in place for lasting accuracy. The adjustment dial is easily access through the ejection port & can be adjusted with any pointed tool without the need for disassembly, allowing efficient & streamlined hop-up tuning. 

For GHK M4 GBB Series:

• Compatible with GHK M4 V3 GBB series (V3 feed nozzle).
• Not suitable for GHK M4 V2 GBB series (V2 feed nozzle).
• Not compatible with RA-TECH NPAS nozzle/bolt group for GHK M4 V2 GBB (V2 feed nozzle).
• Solution: Replace the GHK M4 V2 nozzle with a V3 nozzle/bolt group to make it compatible with the Magnus Pro AR Hop-Up Set.
• The RA-TECH NPAS nozzle set is now available for the GHK M4 V3 GBB system.

For VFC M4 GBB Series:

• Compatible with VFC M4 V2 & V3 GBB systems.
• Compatible with VFC T91 GBB.
• Compatible with VFC M4 GBB models with knob adjustable hop-up (M733, XM177E2, M16A1, M16A2, M727 GBB series).
• Compatible with VFC M4 GBB models with guide-HOP adjustable hop-up (BCM MCMR, BCM MK2, MK18, URGI, SR-16E3 GBB series).
• Note: For the Guide-HOP model, remove the front quick-adjustment system (dummy gas tube, connecting rod, etc.), and the Guide-HOP feature will be disabled.

Not Compatible:

• VFC/Umarex HK416 GBB series (including VFC HK416 Gen2 & Gen3).
• VFC HK416D, HK416A5, M27 IAR models.
  • Solution: Consider purchasing Z-parts HK416D outer barrel and gas block products to convert to the M4 chamber design for compatibility with the Magnus Pro AR Hop-Up Set.
  • Note: For the VFC HK416A5, the appearance of Z-parts HK416D shape products may not fully match the HK416A5. Please refer to Z-parts website for more details.

Not Compatible with Japanese Spec:

• Japanese spec Airsoft GBB inner barrels or precision inner barrel products may require modifications or are incompatible due to different design specifications.
• This includes products from brands like PDI, KM, and Laylax, which are not applicable.