I had a CETME that was one of the old pressed steel receiver CAI guns. IT was all Spanish parts less the receiver and would only take CETME mags. It functioned fine.... after I spent a couple bills in parts "rebuilding" it. Apex had full bolts for a while, I got a non-ground one from them and then used rollers to spec the false head-space. Recoil was horrid, accuracy ok at the range I shot it, and don't plan on reloading any of your brass.
And I heard it was drunk monkeys armed with dremel tools............