Arcturus RS Gen 2 Reinforced Polymer Precision Rotary Hop-Up Unit for AK Series Airsoft AEG Rifles

"Works well in my LCT AK104, although in my experience you have to pick between the gearbox screw for attachment or the 2 screws into the barrel extension. Either one provides a sturdy enough connection on its own. For the gearbox side to work you need to clip the inner ears of the slot as its narrower than the LCT gearbox allows for.
Overall, big improvement over the stock LCT slider hop-up.

"perfect replacement for my ak12 hop up. This gen 2 version was released after I purchased my AK12 so this is a nice upgrade.

"Absolutely buy this. Rotary ______ slide hopups. The included _embedded_ bucking works fine at ~300fps and .25s. Screw to secure the hopup to the gearbox is also very very appreciated. Magazines are a little tight with it on my CYMA shell and APS gearbox. Because the unit is polymer it likely bends to meet the feed hole of the mag a little.