I'm looking to purchase a one-piece scope ring setup for a .284 Win. build. So far I've been eying the F3R Machine, Spuhr, and Near Manufacturing setups. Anything else to add to my short-list? Any reason to look at one over another or drawbacks you've found to any? Mostly used 2pc Leupold, Warne, Talley, and similar sets so I don't have experience with any of these other brands or one pc ring sets, so any insight is helpful.