Heckler & Koch HK33
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The Heckler & Koch HK33 is a 5.56mm assault rifle developed in the 1960s by West German armament manufacturer Heckler & Koch GmbH, primarily for export. Wikipedia
Barrel length: HK33A2: 390 mm (15.4 in); HK33KA3: 332 mm (13.1 in); HK53: 211 mm (8.3 in)
Action: Roller-delayed blowback
Caliber: 5.56mm
Effective firing range: 200–400 m (219–437 yd) sight adjustments; 600 metres (656 yd) with Fero Z24-G telescopic sight
Feed system: 25-, 30-, or 40-round detachable box magazine
In service: 1968–present