AR-15 Skills & Drills by Tiger McKee

Author:Tiger McKee
Language: eng
Format: epub
Publisher: Lightning Source Inc.

“ZEROING” THE AR means adjusting the sights so your point of impact – where the bullet strikes the target – is the same as your point of aim – where you are holding the sights. There is a variety of methods or formulas for zeroing the AR. Instead of trying to use different size targets at various distances and flipping back and forth between one aperture and the other on the rear sight – as required by some methods – I prefer to use the simple technique described below. In my opinion, to get a “hard” zero with the AR you have to actually shoot it at the distance you’ve chosen for your zero, rather than simulate distance by using smaller targets.

Once you’ve zeroed the AR, it’s time to fire it various distances to discover what the difference will be between your point of aim (POA) and the point of impact (POI). This will vary according to barrel length and twist rate, and the type ammo, such as bullet weight and the design or shape of the round. Changing ammo, switching between one type ammo and another – even when they are the same weight or design but different brands – will usually change the trajectory of the round, sometimes dramatically.

When it comes to choosing the distance for your zero there are several factors to consider. First is the offset between the sights and the barrel; the sights are higher than the barrel. This offset comes into play especially at close distances, where the POI will be lower than the POA. You have to aim or hold high for your round to hit where you need it to go. You also have to consider the trajectory of the round. For example, with a 55-grain bullet firing with a one hundred yard zero the POI will be approximately two inches low at 200 yards.

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