This is the Prometheus Soft Bucking. If you want a bucking that will give you extreme accuracy and performance, then this is the one to go with. This bucking works well with many AEGs and PolarStar PR-15s. The Amped Airsoft crew runs these pretty much exclusively in all of their AEGs/PolarStars. This hop up bucking also comes with a matching spacer (nub).
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