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Stock, it has a click wheel to adjust the hop-up. However many prople go for a TDC mod instead where a set-screw pushes on the hop-up arm. It gives much better adjustements. Other just mod the hop-up arm so you have a bit more pressure on the bucking. While the KJ is very hard to break for a GBBR the hop-up is certainly the weakest part. However I dont know yet a "perfect" GBBR platform.
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