Is every kalishnakov on back order?

I heard and read similar pro's and cons. I joined the M1A forum and they spell it out. Certain factory parts, I can't remember what but it seemed to have something to do with the gas block, could be changed out for better ones sold through Brownells that will greatly improve its accuracy. I'm not looking for a tack driver so I'll start with the simplest mods and move up from there until I get it the way I want it. If and when it ever comes in. Gun Broker has two and they start at $1650 and are used.