VFC AR15 GBB Series Upgrade Rotary Hop Adjustment Arm
VFC AR15 GBB Series Upgrade Rotary Hop Adjustment Arm
If your hop up unit is as below, then this hop up arm is correct for you

The original VFC hop up arm tends to lack performance, especially when using big contact surface bucking’s.
This Product combined with the right bucking will increase the hop effect applied to the BB due to the spacers increased contact surface to the bucking, which results in better lifting performance especially when using heavy BBs (>0.4g).
We recommend the usage of bucking’s like the Begadi GBB5/VSR5/VSR7, Flamingo VSR, Modify X-Range, Maple Leaf MR or TNT TR-Hop
Recommended bb weight / power output combinations: 0.36g+ at 1.5J, 0.45g+ at 2J
Adjustment will be more precise/sensitive than with the original arm. Especially with ligher bb's.
Includes 1x 3D printed PA12 nylon curved spacer and 1x stainless steel pin
Compatible with VFC Rotary Hop AR15 series
Material: 7075 aluminum
Production method: CNC
Surface treatment: Oxidized
Model: BB0012
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We are the Gap Filler
Where mainstream production stops, Clutch Precision begins — engineering the missing pieces for true enthusiasts.
FAQs
Quality Standard
In the airsoft world, absolute perfection is neither possible nor practical.
While we constantly work on optimizing the processes, it's still very difficult to achieve perfect results with limited manpower.
Minor tolerances, marks, or finish variations are natural in precision mechanics and never compromise performance or quality.
Support
We take every piece of feedback seriously – but only if it actually reaches us.
Customers who contact us directly will always receive full support: replacement, additional shipment, or refund, handled promptly and without complications.
What we cannot do is monitor complaints posted in Discord servers, forums, or YouTube comments. In those places we see no order number, no details, and therefore we cannot provide a real solution.
Shipping
We aim to ensure fast and reliable delivery to all our customers, whether you’re in the EU or elsewhere in the world.
Shipping is either from our Latvian or Asian warehouse, according to the inventory availability
We will always pick the best lane for your country/area. The average delivery time to EU and UK is 5-10 days, to USA and Canada is 10-14 days, South Korea and Japan 5-7 days
Return & Cancellation
- Orders not yet dispatched can be canceled free of charge.
- EU customers are eligible to initiate return process within 14 days upon the delivery of the parcel
- Returned items must be in resealable condition, otherwise we have the right to refuse the return or reduce the refund amount
- If the return is not caused by our own mistakes, customers are always to bear the return cost
Arrived on time. Love it!
I replaced my 2024 VFC M16a2 stock hop arm with this Clutch Precision one.
Dimensionally, the Clutch Precision arm is too narrow and would wobble in the stock hop chamber without shimming. In addition to that, the central pivot pin is also very narrowand would just barely sit in the holes (of the hop chamber halves) after shimming. Not sure of the long-term consequences.
After shimming however, the arm greatly improves hop consistency over the stock arm. Now the dispersion is finally circular whereas the stock hop arm prints oval groups.
I have yet to test field performance, but at 10m I can shoot 10 round groups with 3x3 cm dispersion (with freshly installed aftermarket inner barrel and bucking. All-stock setup out-of-the-box shoots like 10x15+cm groups with great vertical inconsistency).
Conclusion: Greatly recommended performance-wise, however shimming might be required depending on your hop chamber dimensions.