The KM4 AEG hop-up assembly fits all KM4 Series rifles, including the new SR Series. It comes with everything pictured. Please note that this does not come with the hop-up numb, part E-13, or the bucking, part E-14, which are also available in our ProShop.
Fits these models
Diagram number: 5S. Match the number on your model’s exploded diagram in Part Finder & Diagram. Genuine KWA part, sold direct by KWA.


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