Up front, the springs in the mags marked 1 and 2 need to be replaced, should be able to do all 6 mag springs for around $10. Aside from that, the gun runs flawless and has never given me issue. I would recommend upgrading the hop so that dialing it in is easier on the fly, but once you get it dialed with the current one, you’re good to go. It reaches surprisingly well for how short it is, never felt like I was at a disadvantage with this thing. For the internals, it’s running an Inferno Gen II HPA engine, has a Prometheus barrel and I believe a maple leaf bucking. I upgraded the trigger to the short stroke CNC aluminum trigger (makes the trigger pull a lot shorter and snappier), I upgraded the mag release to the Magpul Scorpion Evo mag release (was planning to do the magpul grip, but I don’t have the tools to make it work. I also grabbed the internal stock stabilizer and thread adapter for stuff like suppressors because this gun is already REALLY quiet, and becomes near silent with a foam filled suppressor on it. The mags are currently connected with some 3D printed bandoliers. The gun comes with a spare O-Ring set for the Inferno engine, all the original parts that were upgraded while I had it (in the semi clear plastic box to the right) as well as the extra M-LOK handguard in the picture. You will need to get a battery for it, but they are only like $8, I took a picture of the connector to make it easier to grab one before this gets to you if you need it, just a standard HPA engine battery. Please feel free to message me any questions you may have. I am happy to answer them as soon as I can.