Sorry I overread your question. I could make a 3k barrel spacer, but I don't have a 3k at the moment.
I know the dimension. I just wanted to know if there is some special drill bit you could use for .572. it's a iittle bigger than a 9/16" drill bit, and a little smaller than 19/32. However, I've never seen a drill bit that big come in increments smaller than 1/16.
But anyway, I just drill a 9/16" hole and file it out, like umpshaplapa stated