The KWA M4 Hop Up Unit is a replacement upper hop-up chamber for KM4 AEGs. This pre-assembled part will repair a broken or cracked hop-up unit for proper accuracy and FPS.
Part 5S is designed for all KWA M4 AEGs, and will fit the CQR series.
KWA M4 Hop Up Unit Part 5S Features:
-KWA OEM Quality
-Precision Fit and Finish