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XM-29 OICW, showing its controls on the sighting unit
XM-29 OICW ammunition - HE (High Explosive) ant TP (target practice) rounds for 20mm unit and KE (Kinetic Energy) 5.56mm NATO round
Caliber: 5.56 mm NATO (KE) and 20x85mm (HE)
Action: Gas operated, rotating bolt (KE), unknown (HE)
Overall length: 890 mm
Barrel length: 250 mm (KE) 460 mm (HE)
Weight: ca 5.5 kg empty; ca 6.8 kg loaded
Magazine capacity: 20 or 30 rounds box (KE) and 6 rounds box (HE)