I'm gonna risk and hope they carry over to revival, wouldn't be surprise if they wipe our inventory though, we'll see with the upcoming revival. Will probably still be able to buy these ones even then in that case. Lol.

If they were SR Grails I would had exchange but Rs are nothing special because you can easily farm R weapons from gachapon. You might need double the amount but considering you can roll gem gacha an infnite amount of time now, til you run out of gems, it's far more convient.