My basic training was with an M16A2 manufactured in the 80s and after a couple hours and ~100 rounds of practice I could group center with iron sights at 500y (457m) and that’s functionally the same gun. Effective range for an AR-15 should be the same 600y(550m) as the old M16s from the 70s and 80s, extended to ~1000y (914m) with extra training, better sights, and a match grade rifle
My basic training was with an M16A2 manufactured in the 80s and after a couple hours and ~100 rounds of practice I could group center with iron sights at 500y (457m) and that’s functionally the same gun. Effective range for an AR-15 should be the same 600y(550m) as the old M16s from the 70s and 80s, extended to ~1000y (914m) with extra training, better sights, and a match grade rifle