The Golden Eagle M4 / M16 Hop-Up Chamber Set comes with everything you need to install it right out of the box, including the bucking, hop-up chamber, adjustment wheel, and bucking lock clip. This airsoft internal part is perfect for replacing damaged hop-up units or for building a custom AEG from the ground up!
NOTE: This hop-up chamber assembly does not include the bottom piece that connects into the lower receiver.
Airsoft hop-up chamber
bucking lock clip
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