The rifle I picked up has no additional receiver holes, but does have holes in the barrel for a scope block. I plan on running it with a Unertl anyways, so it doesn't bother me. Plus, overall the metal is extremely good condition with exception to the bottom metal. For some reason the M54's always had heavily worn bottom metals.
So right now I'm in it for around $650. I've got plenty of room for a nice stock, assuming I finish it myself. And add some checkering just to class it up a little more and I bet I could still make money selling it.
