If your Savage Model 12FV is a .223, I have a different suggestion.
Buy a new pre-fit barrel and switch barrels. It's easy to do.
I have a Savage 10FLP in 308 with a 24" barrel. I bought a Pac-Nor barrel in 338 Federal and I switch barrels. It only takes me 5 minutes to switch barrels. You do need GO and NO-GO gauges and a barrel nut wrench. I use a regular vise and a wooden barrel block. That's all there is to it. Besides Pac-Nor, prefit Savage barrels are available from Shilen, McGowen, Brux and others. Midway USA also has Shilen pre-fit barrels (their's is 26" so you'd have to have it cut and recrowned to your length.
Check the vendors at Savage Shooters Forum (Sin-Arm and Northland), and they can shorten a new pre-fit barrel to the exact length you want and cut a good crown.
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