The FN SCAR is a family of short-stroke gas piston automatic and semi-automatic rifles. The SCAR stands for the Special Operations Forces Combat Assault Rifle. The line of SCAR rifles is diverse and includes both military and civilian rifles. The civilian SCARs use the same multi-caliber architecture as their military counterparts but in the commercially legal semi-auto fire mode. Civilian variants initially included FN SCAR 16S, FN SCAR 17S, and FN SCAR 20S. They are all chambered for 5.56mm NATO and 7.62 NATO calibers, except for the 20S variant, which is available in 7.62mm and 6.5mm Creedmoor calibers. Eventually, they were discontinued and replaced by the 2nd Gen SCARs rifles, recognizable by the NRCH mark added to the rifles' original marks. The NRCH stands for Non-Reciprocating Charging Handle, which added more adaptability and modularity to the rifles, allowing for any shooting position, grip style, or optic choice.