4UANTUM Hop-Up Bucking Friction Pro - GBB Bucking & Nub

Key Features

• Ultimate Consistency: Engineered with a precision single-point contact patch to achieve a perfectly centered axis of spin for every BB.
• Heavy BB Performance: Unique contact patch design is highly effective at reliably lifting heavy BBs (up to 0.48g), ideal for DMR and long-range use.
• Wide GBB Compatibility: Designed for the vast ecosystem of Tokyo Marui-spec GBB Pistols and Rifles (including VFC, TM MWS, Hi-Capa, and VSR clones).
• Set Includes Nub: Comes complete with a dedicated Flat-Type Tensioner (nub) to ensure maximum, uniform pressure is applied by the hop arm.
• Flatter Trajectory: Minimal contact surface reduces air drag and inconsistency, resulting in a flat, accurate, and predictable trajectory.
• Optimized Hardness: Constructed from a durable rubber compound (typically 60D hardness) that balances longevity with excellent BB grip.
• Tech-Friendly: Features pre-formed grooves for easy trimming to fit non-standard or tight hop-up chambers (professional installation recommended).

Centered Spin for Unparalleled Accuracy

The core innovation lies in the bucking's unique contour and single-point contact patch. This design focuses the pressure into a perfectly centered axis of spin on the BB, which prevents the horizontal flyers and inconsistency common with traditional or wide-patch buckings. This results in the flattest, most predictable trajectory possible, allowing marksmen to achieve tighter groupings at range. The material compound (typically a durable 60D rubber) provides maximum friction to effortlessly hop even the heaviest BBs, such as 0.40g and 0.48g weights.

Ready for Performance Upgrades

The Friction Pro is specifically compatible with most standard Tokyo Marui-spec GBB and VSR inner barrels and hop chambers. The set includes a custom-profile flat nub/tensioner to ensure your hop arm applies pressure evenly, maximizing the benefit of the bucking’s design. Whether you are running a custom Hi-Capa, a VFC MWS rifle, or a dedicated airsoft sniper, upgrading to the 4UANTUM Friction Pro is the most cost-effective way to drastically improve down-range accuracy and consistency.