Very nice rifle!
You definitely have a commercial M98 action, since the military thumb notch is missing from the left side of the receiver. FN is a good bet, but If you want to confirm this, take the action out of the stock and look for Belgian proofs someplace on the receiver ring. The Perron (the thing that looks like a candlestick) should be visible somewhere.
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Next, flip the action over and look for a postwar FN date code on the flat just behind the recoil lug on the underside of the receiver:
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The date code is a single digit inside a square/diamond/polygon -- here is the table for decoding this mark:
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Another thing to check is the barrel/receiver intersection inside the action. Look at the left raceway; if it is solid as in the right hand photo below, action is
not post-1948 (or '49, I forget exactly) FN manufacture. This broaching cut was a cost-saving measure.
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Lots of postwar commercial rifles were built using FN actions. Husqvarna used them until they introduced the HVA action in the 1950s. The big mailorder catalog outlets also sold them under house brands like Western Field, but those generally have additional markings on the barrel and/or receiver.
Possibly this rifle has been built by a custom shop, especially if the '44' on the receiver is the serial number.