I think I'm ready to switch my old 5 pin in for a single pin, from what i've read the HHA seems like its the way to go, i'm a little confused about the models tho when i go on their website their models are "optimizer lite king pin" and "optimizer lite ultra" but when i got on cabelas website or search forums for them the models are in numbers like the "HHA DS-5019 ultra" or the "HHA OL-5519"? also what are the ranges of these sights? can you dial them in for 20 to say 100 yards? not that id ever shoot a animal at the distance but id like to be able to practice at that range? thanks in advance!