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    Rifle Scopes AR15-SPR : IOR vs IOR, or other options

    Considered a newbie in riflescope applications; I have an on-going AR-15 SPR-18" build. Most shooting will be on square range, with occasional off-range ones. Range is between 50-500y. I'm leaning on getting a reticle with BDC capability. <span style="font-style: italic">I have an IOR...