AR BZO Affected by Sight Radius?

It shouldn't matter. Height above bore could effect it I think. But sight radius shouldn't matter to zero or trajectory.

All of the data I've seen relates to the military A2 rifles with 20" tubes. I've always wondered if they were relevant with the newer 16-18" barrels. I never really worried about it since I don't use it.

Theoretically it could affect short range BZO versus the actual POI at distance. Realistically with iron sights you are unlikely to notice any difference.

I have one carbine with a carbine length gas system and fixed front sight, it zeroed fine with a 50/200 yard coincidence zero. My others are 15” rails with the front sight pushed all the way out, same zero works on these too.

BZO?

Battle sight zero.

If you know your sight height, muzzle velocity, and ballistic coefficient, then there are a dozen websites which will tell you enough about your trajectory to confirm or disprove your desired BZO.

I’ve never been a fan of generic BZO’s for the kind of shooting I do. My loads never match up quite well enough for me to overlook the offset at range on the sizes of targets I prefer to shoot. You can get away with a lot of disparity if your target is the size of a man’s torso - I’ve just never been satisfied by that low degree of accuracy.