Hi guys,
I've searched here and many other places around the web and I'm still at a loss.

I have a Norinco M14S and I'm trying to install an ARMS #18 scope mount. With the side bolt snugged up the rail is off the bore line by a significant angle. I used chalk on the receiver side to see where the contact points are. It looks like the only contact points are on the two "keys" (horizontal and vertical) of the mount. There is less contact on the horizontal key towards the rear of the receiver.

I've read comments about removing material from the backside of the #18 but don't really understand where exactly. The comments didn't have any pictures associated.

The receiver is clean and free of any burrs. The mount is brand new.

Any suggestions or links to instructions?

Thanks.
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