There are several good choices out there (better than Leupy turn-ins IMO). I like Talleys, Warne's and the DNZ also (although they look rather "clumsy" to me). I'm also fond of pic rails and PRW's, TPS, EGW or similar types when set on the pic type rails. It allows for a bit more fore / aft ER adjustments. Depending on the tube, this often times becomes critical.