It's no secret that the receivers and mounting holes are often off on factory rifles. Even the best machined rings don't do any good if the receiver/mount holes are crooked. I have one rifle built on a Borden Alpine action and I mounted Talley lightweights without lapping them because I trusted the action & holes to be straight. On any factory action they get lapped. As soon as you put the lapping bar to them you'll see how far they're off, it's usually a pretty good bit. It's not Talley's fault the factories turn out crooked rifles.
