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What is the 6.8 x 45-mm UCC?


The ineffectiveness of the 223 Remington and 5.56-mm NATO cartridges is well documented in the military and the law enforcement community. Yes, the cartridge has worked as a general rule mainly because it was the only cartridge available to these units and organizations and therefore has many real world incidents for evaluation. If the range is close and there are no intermediate barriers between the shooter and the target the success rate goes up. Performance upgrades have been made to the 223 / 5.56 cartridges, mainly in the projectiles that are available for that caliber. These improved projectiles have helped the performance of the cartridge but it is still lacking in terminal performance.


6.8 x 45-mm Urban Combat Cartridge Development

The 6.8 x 45-mm UCC utilizes a custom or modified 223 Remington / 5.56-mm cartridge case necked up and trimmed down to accept the 6.8-mm/.277 caliber 115 grain projectile. After years in development, a proprietary propellant was finally formulated that could meet all of the requirements of the cartridge while staying within the operating parameters of the AR15 / M16 / M4 weapon system.

The 6.8 x 45-mm Urban Combat Cartridge is the “Cost Effective Performance Upgrade” for professional users of the AR15 / M16 weapon system including military units, law enforcement agencies, and American Civilian Patriots who appreciate and demand performance.

Advantages of the 6.8 x 45-mm UCC over 5.56-mm NATO

  • Increased terminal performance from all barrel lengths (see ballistic comparisons)
  • Increased terminal performance at all distances (see ballistic comparisons)
  • 6.8 x 45-mm UCC magazines will still function with 5.56 NATO, if needed
  • 6.8 x 45-mm UCC magazines hold 30 rounds, same as 5.56-mm magazines (same combat load)
With the modular design of the AR15 / M16 / M4 weapon system, units, organizations and departments desiring an increase in terminal performance of their operational weapons need only purchase complete upper receiver groups and magazines to obtain that increased performance, while maintaining their existing 223 Remington / 5.56-mm NATO upper receiver groups for practice and training.


“Practice and train with 223/5.56mm. Defend and fight with 6.8 x 45 UCC.”