What exactly do I have here?

[jond41403]

Hello all, was wondering if I could get your help on figuring out if this handguard with the band having a groove in the middle of it is of any significance. Seems like I remember seeing those listed as more expensive than your regular upper handguard band. I recently purchased a lot and these two upper handguards were in it. One with a regular band and one with a grooved band. I have to say, the one with the grooved band certainly looks better finished and more beautiful than the other one but I'm no expert haha. it just seems like The finish on it is original and not messed with.Any help would be appreciated, thanks in advance