So the very first time i took this thing out of the box i was little surprised with the quality of the print, not the greatest, it could be better. But still i was excited, it's very simple to install you literally take out the entire aeg gearbox and insert the hpa system. Upon firing it is where the confusing and frustration began, setting it to 100/120 psi it was getting pretty mediocre fps i wasn't to impressed but it's the way it would fire that really disappointed me, the bb's would dip, there was no consistency, and no range i was very frustrated. Now I'm not saying this to discourage anyone from buying this product but there's something they could've either put in the installation video or put it on there site but the setting the FCU was on was causing ALL my problems....So! Let me explain...there's a setting in the FCU that reads "FCFE" or FCF1"....for the JACK, you want it to be on "FCF1" that's the jack setting...so i reset my FCU and found out the default setting is "FCFE"...changed that to "FCF1" and everything is now perfect. That's the only reason i give this 4 stars, other then that little heart wrenching issue this thing preforms prettying amazingly, hope this helps future ppl out, and happy airsofting.

really happy to system, on top, nothing to say, except that it's a pity that the F2 does not pass. I just have a little thing that bothers me a little bit that the balls do not go up directly when you recharge, you have to shoot a few bursts for his shot and a few more shots for the hop-up effect to come back in the top. but it may come from my joint, I'll know it when I've had a better one