Staff Writer (Updated: 8/9/2016):
The SCAR initially faced off in a July 2007 "future assessment" competition held by the United States Army. The weapon was pitted against the existing M4 Carbine, the impressive Heckler & Koch HK416 modular system and the previously-forgotten Heckler & Koch XM8 developmental combat rifle. The SCAR came in second to the XM8 but bested the HK416 and M4 Carbine in the 60,000 rounds of ammunition that were test-fired.
In 2008, the FN SCAR was yet again the object of attention, this time competing against four other rifles in the United States Marine Corps Infantry Automatic Rifle (IAR) competition. The competition sought to fulfill a requirement for a new squad automatic/light automatic rifle. The SCAR proved its mettle and was selected for an initial purchase batch of 6,500 examples to be delivered over a span of five years. This particular form of the SCAR rifle was of note for its use of a mixed open-closed bolt operation - the first of its kind in the SCAR family line.