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Compatible with all Marui compatible M4 series Airsoft AEG. The Ultimate Hopup Unit designed by Madbull

Parts and Materials:
Metal body, includes a famous MadBull blue bucking (60 degree)
Tracer unit is optional.

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This is only good for distirbutors who need a lot of buckings for repairing AEGs. NOTE: You have to buy at least 10 pcs of retail packs of the buckings (SAH) with this order. (Please note: Only 50 pcs rubber buckings and 50 pcs spacers included. No silicon buckings.) Learn More