 Other difference included the use of improved steel (to handle the increased pressures of the 7.62mm NATO round), and a redesigned extractor to cope with the rimless round.The original (2A) design incorporated the Lee–Enfield rear sight which has graduations out to 2000 yards.The re-designated "Rifle 7.62mm 2A1" incorporated a more realistic 800 meter rear sight in 1965.