When I say "original Redfield" I'm talking about the early one that has different hole spacing than the factory chose to use. It does have 2 holes for the receiver ring though.

If I was in your shoes, I'd Loctite those single screws in place and go shootin' Risky? A little sure, and I wouldn't have it as my only gun on a serious hunt, but I bet it will stay put better than feared.

Or, you could buy one of my no-drill mounts but they ain't exactly cheap.