5KU CNC Machined Aluminum Hop-Up Unit for AK Series Airsoft AEGs

"Pros: looks cool.

Cons:
Will not fit a stock cyma 048. (Ak74u). Biggest issues I have found so far:
1) does not come with required screws.
2) the hop up has a notch in the back for the gearbox (which does not fit the front screw area) this will have to be modified for it to fit.
3) the hop up block between body and the unit isn’t notched like the stock one.
4) hop up adjustment arm is plastic, not metal which may break after a while.

Due to above issues 2/3 I have not been able to test if the unit is better than the stock one yet when it comes to chambers hop up hold, or air leaks.

"I rarely write a truly bad review but this Hop Up is truly terrible. As packaged, it doesn't include half the screws you need to assemble it; it's horribly cast with all kinds of burrs inside and out, doesn't line up with the front of the gearbox or the outer barrel screw holes, and has a hole for the nub that is so misshapen and sharp on the edges that it cut my expensive, new, and out of stock Modify bucking. It's now in the garbage and I'm practicing deep breathing. Only good thing about this hop up is it's out of stock.