A bit more info...
I've noticed pics of wooden stock rifles having IO inc, Monroe NC on their receivers, the side folder I received is marked IO inc, Palm Bay FL.
Trigger is marked IO inc, regardless of its reputation, it is the best trigger I have felt on any AK including tapco, Arsenal and RSA triggers.... Time will tell if it holds up, don't see why it wouldn't though.
Trigger pin retaining plate is also IO inc. as well as the included slant brake.
The bolt carrier retained it's casting finish on most surfaces with minimal secondary machining operations to complete the part. I assume that with advances in mold making and casting technology that modern castings are able to hold the tolerances required on most AK parts, as long as the part was correctly heat treated it shouldn't make a bit of difference functionally, but it does have a dramatically different surface finish than a machined surface. I assume both trunnions are cast and manufactured in a similar fashion.
Someone above posted about jacked up muzzle threads, the rifle I received had good threads.