If the action is open across the top like most Savage actions, it could be a 12 FV with an aftermarket stock.
I have one in 6.5mm CM that I put in an Oryx chassis with an AICS mag with an action that is right ported but open across to the left like a regular Savage action.
The 12 new FV is a small shank action.
The 12 FV is especially made for Cabela's, but the stock came without an aluminum stiffener which I found caused the stock to twist as it was fired.
It was very accurate even with the factory stock.
The replacement chassis made it stiffer and improved the accuracy by about 12%. That might be why the stock was replaced.
I also have a 12 LRP in 6.5mm CM that is a large shank. It has a right ported action without being open to the left side. It came with an HS Precision Stock which is has an aluminum stiffener.
It is as accurate as the 12 FV with the Oryx chassis, even though it cost a lot more.
Some of the single shot model 12s, like the 12 LRPV, have a left ejection, but I don't think they come in 6.5mm CM.
To understand which shank a particular rifle has, you need to measure the barrel nut. The large shank barrel nut is shorter than the small shank barrel nuts by a bit.
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