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These were the only hop up bucking i could find for the kwa mp7gbb
These were a lil deformed out of the box and they did not create a good seal on the bb. I hade to rap 2 thousands of a inch of foil around the hop up before I inserted it to get a good seal. I dont know if you need the “tnt” Barrell for this but i was still a lil aggravated with the product. All in all i did get it to work but not easy.
