Prometheus Hop Up Tensioner w/ Soft & Hard for Marui AEG (Flat type)

Prometheus Hop Up Tensioner w/ Soft & Hard for Marui AEG (Flat type) Rubber Construction Enhance BB flight in a long and straight line, with wider contact point to stabilize the BB Super hop up effect Suitable For Toyko Marui AEG Rifle Include Hard & Soft Hop-Up rubber buffer knub