I further think that the front base in this pic is the short-action version, the long-action specimen having the ring and the fixing-screw swapped over fore-and-aft so that the ring is flush with the ejector opening: which in rifle in the pic would allow the 'scope to come back a little.
As mentioned, the Optilock extended front base would put the forward ring back over the opening in the receiver. I used on many years ago with a Weaver 'scope on an old Sako .243
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