So I have an 11.5" "Sorta 733 build" with a fixed A2 carry handle, carbine gas system, non-F marked front sight base, with 0-800m A2 rear sights shooting 55gr. M193.
Now I know that the elevation adjustments on the 800m A2 sights are designed to work with 62gr ammo from a 20" barrel with a rifle-length gas system. So my setup, cool as it is with the A2 sights, is pretty far from what those sights were designed for so none of those elevation marks really mean anything if I decide to start screwing with the sights. Now realistically, I just have the sights set to a max point blank zero, and if the target is outside that range, it's not a target I need to be shooting at with an 11" 5.56.
But I tend to nerd out about these things and got to wondering, would the 0-600m sight assembly from an M4 carry handle make more sense to install in my upper? I'm assuming it's regulated for 62gr. from a 14.5" barrel with a carbine gas system since that is what it was originally designed to be used on. So while still not quite the same as what I'd be running it on, an 11.5" carbine is alot closer to a 14.5" carbine than it is to a 20" rifle. And perhaps the 55gr bullets help offset some of that velocity loss from the shorter barrel. So atleast the elevation markings somewhat more closely correlate with what the bullet is actually doing.