A bit of a long shot but I have a set of NF ultra lite rings, 30 mm Medium height I'd like to trade for some lows. I bought these and mounted the scope, but they are a bit higher than expected. They haven't been lapped, just thread locked. I would even throw in $20 or so if you had brand new lows, or trade for unlapped lows. They've been on the gun for about a month, range trip only, like new.