The AD Recon, by ADM (American Defense Manuf) is, IMO and IME, the best QR scope mount out there. The return to zero is fantastic. In front of numerous witness', i've hit my 12" plate @ 1000 yds, removed the scope/mount, replaced the scope/mount and done it again and again and again. The trick is to insure you use the same technique to replace the scope/mount, every time.