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- Shop and workshop in Aulum, Denmark
About 4UAD GBB Hop-Up Bucking
The 4UAD GBB Hop-Up Bucking (4UANTUM Friction Pro) is a high-performance hop-up bucking for gas airsoft guns – both GBB pistols and GBBRs. Like the AEG version, it has a traditional single-point design with a contoured contact surface that can lift BBs up to 0.48 g depending on the setup.
The bucking is orange and 15 mm long and fits most gas blowback platforms with Tokyo Marui-standard hop-up. It is an obvious match for the 4UAD Magnus Pro hop-up chamber, which comes without a bucking.
Precise hop-up for gas guns
A new hop-up bucking can give a GBB a noticeably more stable trajectory.
- Lifts up to 0.48 g: The contour of the contact surface gives enough friction for heavy BBs – the actual limit depends on the rest of the hop-up system.
- Single-point design: A small contact patch and precise pressure point give consistent backspin.
- For GBB and GBBR: Fits most gas blowback platforms with Tokyo Marui-standard hop-up.
- Match for the Magnus Pro: Combine with the 4UAD Magnus Pro AR GBBR hop-up chamber, which is supplied without a bucking.
- 15 mm, orange: Short GBB length – the orange colour makes it easy to identify.
Maintenance and safety
Fitting requires knowledge of the gun's internals – if in doubt, have a workshop do it. Always check the gun's velocity after an upgrade so it stays within site limits, and make sure the gun is unloaded and without gas/battery while you work on it.
Delivery and returns
Shipping options and prices for your country are shown at checkout.
Full 14-day right of return with a money-back guarantee. Unused items in unopened packaging can be returned for up to 365 days in exchange for a gift card. Easy returns via our returns portal. Read more in our terms and conditions.
