4UANTUM Friction Pro GBB Hop-Up Bucking – 4UAD

4UANTUM Friction Pro hop-up bucking by 4UAD SmartAirsoft for GBB replicas and VSR-type spring rifles, designed to give every BB the same spin, shot after shot. Its single contact point, contoured to generate more friction, lifts even heavy sniper BBs on a flat, consistent trajectory.

Features and technical specifications

• Manufacturer: 4UAD SmartAirsoft
• Line: 4UANTUM Friction Pro
• Manufacturer code: GBB-001
• Type: single contact point hop-up bucking
• Compatibility: most GBB replicas and VSR platforms
• BB weight: up to 0.48 g
• Length: 15 mm
• Material: rubber
• Colour: orange

How it works

The bucking acts on the BB through a single contact point, which keeps the axis of spin centred on every shot. The reduced contact surface limits errors, while the contour of the contact patch adds just enough friction to lift even the heaviest BBs.

Fitting

It replaces the original bucking in GBB replicas and VSR-type rifles. After fitting, adjust the hop-up with the same BB you will use in game to get the most out of its consistency.

In the field

On GBB rifles and VSR-type bolt actions it lets you use heavy BBs while keeping a flat, repeatable trajectory: a simple upgrade for players looking for range and precision in long-range shooting.