A1 sights on a 16 inch barrel

[C-grunt]

I recently built a 16 inch carbine with a slick side M16 style upper and A1 sights.

My plan is to zero the irons at 200 yards. With a 200 yard zero does anyone know what the rough zero will be for the long range L sight?

From reading about the M16/A1 I see people say the L sight was anywhere from 350 to 500 meters.

[GH41]

I recently built a 300BO rifle on an A2 upper. Haven't shot it yet. Not sure this will help but have a look at it. https://savannaharsenal.com/2017/04/08/how-to-zero-ar-15-a2-type-sights/

[Todd.K]

Everyone I know who ever ran an A1 upper swapped in an A2 peep to get away from the dual plane.