KWA - Hop-Up Assembly for KM4 AEG SeriesKWA-HOPUP-M4
M4 Hop Up Chamber. OEM replacement for KWA KM4 series AEGs. Designed to fit KWA only, will not work in other models.
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