4UANTUM Hop-Up Bucking Friction Pro – GBB Pistol

The 4UANTUM Hop-Up Bucking Friction Pro is a premium aftermarket GBB pistol hop-up upgrade engineered to deliver reliable backspin and stable flight trajectory. Whether you’re upgrading a CANiK SFx RIVAL or another compatible gas blowback, this hop-up bucking and nub assembly replaces factory components to reduce inconsistency and boost accuracy downrange.

Key Features

• Friction Pro Technology – advanced material compound optimises hop-up contact, improving backspin consistency across varied weather conditions and BB weights.
• Easy Installation – accessible on the outer barrel once the slide is removed, making field maintenance and adjustment straightforward for UK skirmishers.
• Precise Nub Design – engineered to work with 0.20 g BBs and heavier weights, supporting flat trajectory and grouping.
• Compatible with CANiK SFx RIVAL – direct fitment for this popular gas blowback platform, simplifying the upgrade process.
• Durable Construction – precision-moulded polymer and metal components built to withstand repeated cycling in semi-automatic fire.

Real-World Use Cases

Urban CQB players benefit from tighter grouping at indoor close quarters, where hop consistency makes the difference in engagements. UK woodland and milsim skirmishers appreciate the improved accuracy when using heavier BBs (0.25 g–0.28 g) over longer sight lines. For speedsoft competitors and secondary-weapon specialists, this hop-up upgrade ensures reliable performance during fast-paced play.

Technical Specifications

• Product Type: Hop-up bucking and nub assembly
• Platform: CANiK SFx RIVAL
• Hop-Up Design: On outer barrel, accessible when slide is removed
• FPS (0.20 g): Approx. 300 FPS ± 10%
• Magazine Capacity: Approx. 22 rounds
• Magazine Compatibility: Gas, low-capacity
• Power Source: Green Gas
• Rail System: 20 mm pistol rail
• Pistol Length: 20.5 cm
• Inner Barrel Length: 4.5 inches
• Weight: Approx. 0.55 kg
• Construction: Alloy outer barrel, slide and controls; steel pins and screws; aluminium magazine well extension; polymer frame and backstrap
• Firing Mode: Semi-automatic
• Colours Available: Black, Grey, Dual Tone

What’s in the Box

• 4UANTUM Hop-Up Bucking Friction Pro assembly with nub
• Compatible low-capacity gas magazine

Compatibility & Upgrades

This hop-up bucking is engineered for CANiK SFx RIVAL gas blowback pistols. Pair with green gas (or propane adaptor canisters for year-round UK play) and compatible 0.20 g–0.30 g BBs. The 20 mm pistol rail accommodates tactical lights, lasers, and red-dot sights for enhanced performance in CQB environments. Regular cleaning of the hop-up nub and bucking extends longevity and maintains accuracy.

UK Legal & Site Notes

Gas blowback pistols fall under the Violent Crime Reduction Act (VCRA) and are classified as RIFs. If you do not hold a valid UKARA membership or equivalent defence, you must purchase a two-tone or clear version. Before attending any UK skirmish site, confirm the site’s FPS and joule limit for pistols (typically 350–400 FPS on 0.20 g BBs). This upgrade is intended for players aged 18 and over.

Stock the 4UANTUM Hop-Up Bucking Friction Pro at Airsoftdirect and unlock tighter grouping in your GBB pistol. Fast UK dispatch and expert support. Explore our full range of hop-up upgrades and gas blowback accessories to maximise your secondary weapon’s potential.