Hop ups are maybe the single most effective upgrade above all else. I put this in my kac pdw to replace the crappy vfc clear plastic and the
difference was day and night! I ordered this with the systema bucking and the combo works excellent! This is my first aeg so I'm not familiar with
how it should perform but bbs now fly and float out like my vsr, not arc as if I was blowing bb's out of the barrel. Also, there's an o-ring on the
feed tube, which makes mag fitment snug and compression tight. My mags don't wobble anymore either. Great investment! If you're thinking about
upping your fps, try this first!