"Having had this for just under a month and having gone through it inside out, I think I can give some pre-skirmish impressions. Overall I'm very pleased, especially as someone who likes to take my guns apart, but the devil's in the details.
Meh. Receiver appears to be steel, everything else is pot metal (magnet test). Came initially with wobble in the lower handguard and the stock. Front/back and side/side wobble was eliminated by just tightening up a screw on the front lower handguard ring, and the remaining wobble was easily eliminated by padding with tape/velcro. Upper handguard actually had no wobble because it is held in with an extra thin metal ring, which is a bit unsightly but effective in ensuring there was no wobble on this piece. One thing to note is the upper handguard cannot be replaced with the ring (you can put it on without, but there may then be wobble, again, velcro/tape) without unscrewing the handguard fixer, which is no big deal really. The magwel is pretty loose. You'll likely get wobble on most standard AK mags, though less so on pts/bulgarian style mags. I addressed this, again, with some velcro padding inside the magwell. Doesn't eliminate all wobble, but reduces most of it. Note that even with wobble, I haven't had feeding issues. The extra magwell lip is a nice touch and easily removable. Some people may also be fans of the modified mag release, but I found it pretty pointless personally and replaced it with an old standard trigger guard I had lying around. One last nitpick that shows in the pics as well, this does not come with a fake cleaning rod and the front side/gas block are not sufficiently ridged to hold one, so there's just a lonely hole on the front grip.
Probably a point of concern, but the electric blowback is actually very simply implemented and can be completely disabled without even getting out the gearbox. The hybrid gearbox has a slit in the spring well that a blowback plate screwed to the charging handle fits into so that when the piston flies back, it will push the plate back as well. Disabling the blowback is just a matter of unscrewing the the plate from the handle and sliding it out like a dust cover button. I didn't bother, since it's already pretty unobtrusive and actually helps reinforce proper thumb placement when shooting off-hang holding the mag. Note that if you bunch up your wiring and don't push your stick battery all the way into the upper handguard, the charging handle can get caught and not return to closed position after a blowback, which is annoying but doesn't impact operation.
Takedown and Internals
This imo is a big strength of this gun over a lot of other BLOODYSCREENSOREAL metal AKs out there, but it could be seen as a downside for realism or people who want a gun they can play catch with without damaging (not me). The trunnions are kept in by hex screws instead of rivets. Again, a plus for me but probably not for most people in the market for an AK. I like being able to break the whole thing down like an old marui AK, which is a sharp contrast to, say, my E&L, which is pretty much unassailable without risking some serious damage. Online shop pics for the gun depict it with rivets, so maybe I got a special snowflake, but placement of the grub screws on the rear sight block suggests they expect you to be able to remove the entire front assembly to get out the gearbox (second grub screw on the bottom without room for even horizontal access).
Actual internals are surprisingly good. A big draw for this gun is the hybrid gearbox with the quick-change spring. It's pretty sturdy, and if it weren't for the awkward way they shaped it for EBB (basically, there's two dust cover button slits, and the actual dust cover button is non-standard and goes on a non-standard slit) I'd be getting these to drop into everything since the quick-change not only makes it easy to adjust for power, but it's one less pain point for putting the box back together. Quick note on the spring guide, the bearing's metal but the guide itself is a tough plastic so that's something worth replacing, regular spring guides should work with this just fine though this one has more teeth. Again, YMMV but when I cracked it open, other than greasing that made it look like it was assembled in a KFC, everything checked out for being able to run at least an m120. Gears were beefy steel and shimmed well. AOE was good too. I did not check airseal. Wiring was un-soldered type. I didn't address the hopup/inner barrel, since I plan on replacing those anyway, they look bog-standard stock, however. Overall, it seems pretty solid.
So overall impressions: solid for the value, but not for everyone. All the bells and whistles like the quick-change spring (comes with a spare M120 and M110, or at least mine did), magwell guide, etc. etc., makes it worthwhile. Though, at the same price point, if you're just looking to get a first gun or something you can shoot stock for cheap, a CYMA or JG would probably be a better proposition as you can probably get something equivalent of this in the quality spectrum for cheaper, just lacking the APS perks like the hybrid gearbox and whatnot. For me though, this is about as close to an ideal cheapie to tinker with and turn into a monster as I can get, only personal downfall is externals could have been better quality. Everything else is great.
"Not a lot of reviews on this gun yet, but lots of questions via facebook posts so I thought I would add a review.
The overall build of the gun is quite solid. It weighs around 6 pounds unloaded with no batteries. A small amount of play has developed in the front lower hand guard in the 6 months since I purchased it. The receiver cover has never closed properly on it's own due to a slight manufacturing defect (might only be limited to mine) that requires me to slightly squeeze the lower receiver together to fully lock it in. The metal receiver parts and outer barrel assembly have a nice matte black finish. The standard orange flash suppressor was easily removed for a more appropriate black metal one (14mm negative / counter-clockwise). Being a left handed shooter the custom selector switch does nothing for me, but righties that have tried it like it. I immediately, and easily, disconnected the blowback feature by simply opening the receiver cover. The ergonomic pistol grip is comfy. The mag release took some practice to get use to, but I now prefer it over the traditional style.
I am guessing it comes with a torque motor as it shoots around 14-15 rps with an 11.1 v li-poly and an M115 spring. The gun came with three springs in the box (~450 fps / ~425 fps / ~370fps). I have not had a need to crack the gearbox open yet so I cannot comment on the internals. The wiring appears to be the nicer silver plated. It has a large type 20 amp blade fuse easily replaced at any automotive store or radio shack. The motor connections are standard spade type for easy motor swap (a plus above CYMA which solders their motor connections). 8mm roller bearings are stock on this gun so one less future upgrade. A nice feature is the quick change spring. Simply remove the crane stock and the buffer tube (four screws) and swap the spring (7mm hex key needed). I've only put around 20k rounds through the gun and no problems to report. Shoots as straight as straight can be with a low velocity spherical plastic rounds with the stock barrel.
One of the key features is the ability to run two batteries simultaneously. The batteries must be of the same voltage and chemistry (ie 11.1 v li-poly or 9.6 v nimh). The wiring is done in parallel so you get the combined mAh of both batteries (NOT the combined voltage). What the heck does that mean? Basically the voltage of the battery (the higher the number) impacts how fast the gun shoots (yes there are other variables that affect the speed). The higher the mAh (milliamp hours) of the battery the longer it shoots before having to be recharged. If you use two 1600 mAh batteries you get 3200 mAh of run time.
The crane stock holds a standard crane stock type battery available here on Evike. I am using the BAT010 11.1 li-poly.
Under the receiver cover in the alternate battery position it can hold from a 8.4v to at least a 10.8v stick battery. You might be able to get a 12v stick battery in there, but since I do not own one I cannot say for sure. The Matrix BAT-LP-M003 11.1 li-poly stick battery can be used but requires a certain amount of finesse, patience and wire management to get it to fit.
In my opinion "standard" AK style mags (either 47 or 74) just do not look right with this gun. I am using the MAG-C106 450 round Polymer Bulgaria/Magpul PTS type. Tacti-cool gun requires tacti-cool mag. I also have an M4 and the Magpul PTS type AK mags fit perfectly into my M4 mag pouches.
Would I recommend this gun to someone? Absolutely!