Bit of a weird one.  This is a gun I've owned for many many years, I had a build idea in mind initially, I changed around the externals a few times but in the end I just never was quite happy with the result vs the original image I had in mind.  I've got more than enough AR AEGs so it's time to just move on.  For those who may remember, VFC sold it like this originally many moons ago:

This is the core of an AR, like a kit build type deal you sometimes see.  Good for someone to add on their own bits, no need to remove and sell an original stock and handguard.  To my knowledge, this style of AEG was discontinued a very long time ago so I think the basis is excellent to be built on and create a super cool KAC rifle.  The receivers are good and solid, outer barrel is the original same as the buffer tube, faux gas system all good.  Barrel nut is just a cheap place holder from my spares box, I'd presume anyone buying this will want to put on some sort of freefloat, so with the OB, gas block/tube and upper all good you just need to pick your handguard (stock too) and you'll be gravy.  Pistol grip is an E&C copy of the MOE.  VFC replica of the KAC TTB included as shown.

Internally, it works... I may have used this once but I honestly can't even remember.  It doesn't sound nice, it's old VFC (around 10 years afo) so if you don't know what that implies this probably isn't the gun for you.  The casing itself should be just fine, but again this is a project.  Stock inner barrel and old school hop unit.  If you want a snappy and silky sounding gun you're going to need to spend a bit on parts and know what you're doing.  It has been rewired with some quality thick wiring though so if you're not adding a MOSFET it's good in that regard.