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LWRC Six8 UCIW assault rifle (USA)

The LWRC Six8-UCIW assault rifle was developed by American small arms manufacturer LWRC International. Based on their own M6 family of rifles, which in turn are an evolutionary versions of the ubiquitous AR-15 platform, Six8 series of rifles is unusual in that it is specifically adapted for slightly larger and more powerful (than 5.56mm/.223) 6.8x43mm SPC ammunition. Originally developed for US Special Forces, the 6.8mm SPC cartridge found relatively little acceptance in USA. However, Saudi Arabia and Jordan adopted 6.8mm ammunition for their respective Royal Guard units, and purchased significant numbers of select-fire LWRC Six8-UCIW (Ultra-Compact Individual Weapon) rifles starting in 2012. Semi-automatic versions of these rifles are available for law enforcement and civilian sales in USA, with variety of barrel lengths.
In service Six8-UCIW rifles are used with 6.8mm ammunition loaded with 90 grain (5.8 gram) bullets, with muzzle velocities from 8.5” barrel being around 2450 fps (750 m/s).

LWRC Six8-UCIW assault rifle
LWRC Six8-UCIW assault rifle


LWRC Six8-UCIW rifle is gas operated, using proprietary short stroke piston system. Bolt group, upper and lower receivers are based on M16 / AR-15 system but specifically redesigned for 6.8mm ammunition. All firing controls are fully ambidextrous. Sighting equipment is installed using integrated Picatinny rails on the upper receiver and aluminum alloy forend. Rifle is equipped with shortened buffer / stock tube and M4 carbine style telescoped stock. Ammunition is fed from 30-round plastic magazines, developed by Magpul specifically for 6.8x43mm cartridges.


LWRC Six8-UCIW assault rifle
LWRC Six8-UCIW assault rifle


Specification Value
Full text name LWRC Six8 UCIW assault rifle (USA)
Caliber cartridge 6.8 Remington SPC (6.8x43)
Action type select-fire
Trigger type sa
Overall length, mm 692
Length, folded, mm 610
Weight empty, kg 2.83
Magazine capacity, rounds 30
Cyclic rate of fire, rounds/min 700 - 900