In my search for an optic for a 20" .308 build, I came across an early model IOR-Valdada 4-14x50 in mint condition. Its a 30mm tube, with MP-8 reticle, 1/2 MOA adjustments, and with parallax asjustment on the objective. Any ideas on how old this scope would be, and any reasons to avoid it? How solid are the turrets, and any known issues with this particular model? I suspect that the glass will be superb, but I remember reading about some QC issues with earlier IOR optics. Thanks!