Does your BTFE have the draw bolt?
If not, in combination with the standard loop, the gun would have likely left the factory with a standard splinter forend.
If it does, look for remington repair codes. It is a possibility that a BTFE was added by Remington and the lug not changed out. I have observed guns where this looked to be the case.
A research letter would also help too.
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B. Dudley
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