I would say the MR-3D would verify as original. Unless for some reason, you might think it was faked.
The MR-3D was available from the factory as an accessory, as well as being shipped on some models. That was my point. A lot more MR-3D grip frames shipped than were installed on guns.I would say the MR-3D would verify as original. Unless for some reason, you might think it was faked.