"...swap my parts over..." All of 'em except the bolt were designed to be 100% interchangeable between rifles. The bolt requires fitting for headspace.
Century Arms International assembled milsurp rifles, of all kinds, out of parts bins, with no QC of any kind. Not even ensuring the headspace was good so the rifle is safe to shoot. You should at the very least have the head space checked.
"...My CAI is great, just isn't real deal..." How so? Just because Century cobbled it together does not mean the receiver is not genuine. Century did disassemble rifles(usually Lend/Lease stuff) for the parts, but they did not make receivers.
"...Been shooting it for years...Accurate, and reliable..." That does not mean the rifle is actually safe to shoot.