If both barrels are dated RA 44, then look at the muzzle. The milling of a 03 barrel is entirely different from that of a 03-A3. Also, not always but often a 03-A3 barrel will have two wide grooves rather than the four traditional grooves. This is not a guarantee. I have both two and four groove RA barrels of Remington 03-A3 rifles. Have not personally seen a 03 barrel w/ two grooves. Also on a 03 barrel there will be a "spline cut" at the rear where the sight base collar is fitted.
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