Hey all just decided to do a quick review for those looking into this.
I have the Kalash Version, if you want the best out there grab the VFC version, essentially you'll have a better look and feel.
However I want to focus mainly on the GHK parts itself as that's what matters.
To make things simple, out of the box it preforms well, however the magazine likes to cool down quite a bit so that's a turn off.
Items to replace, if you're getting the drop-in kit I suggest you avoid getting the stock parts from the beginning.
Plastic Bolt (cracks in two after couple hundred rounds)
Plastic Hop Up (it's plastic....piece that releases BBs breaks easily)
Bolt Carrier (It'll mash itself up eventually, esp with an aluminum bolt installed)
As of now I have the steel bolt carrier and hammer coming from DaytonaGun which is costing me about $230CAD not including taxes/duty.
Aluminum Bolt and Metal Hop Up are costing me about $130CAD.
Other upgrades? Well the inner barrel and hop up rubber are the same as ones you'd find in an AEG so you might as well switch'em out for a tightbore and maybe even a longer barrel and cover it with a PBS-5 silencer for increased accuracy/better groupings.
I have two propane magazines and one CO2 magazine on the way as well.
Stay tuned.