A battle rifle is a rifle firing a full-sized rifle cartridge, such as .303 British, .30-06 Springfield, 7.62x54mmR, or 7.62x51mm NATO, from a full-length barrel. Battle rifles are usually semi-automatic; however, some have select-fire capability. Almost all battle rifles have a long barrel and fire a large caliber rifle round. Like assault rifles, they often have carbine variants as well.
Battle rifles, at one point, were a mainstay of militaries; rifles such as the M14, FN FAL, and the Heckler & Koch G3 often served as the main service rifles. The use of battle rifles as main service rifles declined with the introduction of the assault rifle; however, they still serve in DMR roles, or as sniper rifles.
Battle rifles now generally serve as designated marksman rifles (DMR), or as sniper rifles. Many service rifles were modified for this role, and some newer battle rifles even introduced, designed specifically for these roles.