Rifle Zero

Via Borepatch

We often receive questions or hear interesting theories as the appropriate zero for the AR-15 platform. As a result, we have compiled our reasoning for why we advocate the 50- or 100-yard zero for the platform and advise against the 25 yard zero. When asked, which is the best zero, to steal from Kyle Lamb in Green Eyes, Black Rifle, our answer is: whichever zero for which you know all your hold-offs for, or that don’t require math to figure on the fly. We also need to be more realistic about what type of shooting and at what distance we are likely to use our rifle for. So before we touch on those points, let’s look at trajectories for the various zeros a little closer.

First, we need to understand what is happening when we zero a rifle. Bullet trajectory follows the following path when it leaves the rifle:

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