Good chance that, as well as the screws, the rail has been glued to the receiver, same as factory fitted rails on Tikkas. There may or may not be loctite on the actual screws - they may simply have picked up some adhesive from the rail on their way in.
The bloke who runs the YT channel "Bolt Action Productions" removed the rail from his Howa U/L, and it shouldn't be hard to contact him and enquire as to how he got it off.
Rails are an abomination in most cases - make low scope mounting impossible with most rails, and then the owner puts on a cheek riser to compensate for the scope being up where it doesn't need to be. They have their uses, but on a Howa U/L isn't one of them.
Either way, I 100% agree with those who suggest getting it back from the shop before they bugger something.
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