What range are you going to zero at? Most .223/5.56 rounds will actually require you to aim lower than intended point of impact to hit your target between 50-200 meters, depending on your zero.
50 meter zero should generally be "zeroed" at 200 meters.
Shorter than 50, aim higher (barrel is below sights).
Between 50 and 200, aim lower (sights and line of bore intersect at 50 yards and line from barrel continues upwards as does the bullet in flight).
At 200, gravity should pull the bullet back into line with the sights. Beyond 200 yards you aim high as gravity will pull the bullet below point of aim.
If you do 25 meter, replace 50 with 25 and replace 200 with 300. Same story, roughly.
Remember that this is just a "rule of thumb" and is not accurate for every single ammo type and bullet weight. But it should be close enough to keep you on target. Best way to learn it is to shoot it.