Edited the original SB556 post to reflect multicaliber options. Now here are the SB556 Commando, IAR and PDW variants:
SB556 Commando:
Weight: 2.45 kg empty, 3.2 kg loaded
Length: 760 mm stock extended, 680 mm stock retracted
Barrel: 292 mm fluted cold-hammer forged
Cartridge: 5.56 x 45 mm NATO, 300 AAC Blackout
Action: Short-stroke piston, rotating bolt
Rate of fire: 700-800 rounds per minute (cyclic)
Muzzle velocity: Depends on cartridge
Effective range: Depends on cartridge
Feed system: STANAG magazine
Sights: None provided, MIL-STD-1913 rail allows attachment of various sights
SB556IAR:
Weight: 3.2 kg empty, 3.8 kg loaded
Length: 982 mm stock extended, 898 mm stock retracted
Barrel: 508 mm fluted cold-hammer forged
Cartridge: 5.56 x 45 mm NATO
Action: Short-stroke piston, rotating bolt
Rate of fire: 700-800 rounds per minute (cyclic)
Muzzle velocity: 948 m/s
Effective range: 600 m point target
Feed system: STANAG magazine
Sights: None provided, MIL-STD-1913 rail allows attachment of various sights
SB556PDW:
Weight: 2.05 kg empty, 2.8 kg loaded
Length: 658.5 mm stock extended, 578.5 mm stock retracted
Barrel: 190.5 mm fluted cold-hammer forged
Cartridge: 5.56 x 45 mm NATO, 300 AAC Blackout
Action: Short-stroke piston, rotating bolt
Rate of fire: 700-800 rounds per minute (cyclic)
Muzzle velocity: Depends on cartridge
Effective range: Depends on cartridge
Feed system: STANAG magazine
Sights: None provided, MIL-STD-1913 rail allows attachment of various sights