Heckler & Koch XM8
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The Heckler & Koch XM8 is a lightweight assault rifle system developed from the late 1990s to early 2000s. The rifle was designed by German small arms manufacturer Heckler & Koch, and shares design and engineering with their G36 rifle. Wikipedia
Barrel length: 320 mm (12.5 in)
Cartridge: 5.56×45mm NATO
Designed: 2002
Effective firing range: 500 m (550 yd)
Feed system: 30-round detachable box magazine, 100-round C-Mag drum magazine
In service: 2010–present
Manufacturer: Heckler & Koch; Alliant Technosystems