XM29 OICW
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The XM29 OICW was a series of prototypes of a new type of assault rifle that fired 20 mm HE airbursting projectiles. The prototypes were developed as part of the Objective Individual Combat Weapon program in the 1990s. The term SABR was also used... Wikipedia
Action: Gas-operated, rotating bolt
Effective firing range: ~600-800m (Max ~3.000m) HE: 1.000m (Max: ~2.000m)
Feed system: KE Module: Various STANAG magazines; HE Module: 5-round detachable box magazine
Length: 890 mm (35 in)
Mass: : 5.4 kg empty and 6.81 kg loaded (planned); 6.8 kg unloaded and 8.17 kg loaded (actual);
Muzzle velocity: 750 m/s (2,500 ft/s) (KE); 180 m/s (590 ft/s) (HE)