I have 4 r1 3x12x56 since since 2010 ish never had a problem.I have 2on 243s,1 on a 22-250, and 1 on a 25-06, my nephew has shot a lot of deer with the 243 combo. I have culled a but ton of deer with 1 on a 243, low light abilities I would rank right up there with my 2 Swarovski z-6 scopes. If you dial you can get custom turrets from Kenton industries.They are a little heavy at 21 ounces but I dont usually carry them up mountains.Personaly I rate them as a great scope for their intended usage. Give Doug a call he is very helpful and will take care of you.