Less Lethal Africa has developed a conversion kit to allow AR-15 rifles to cycle their 5.56LLAx45 less lethal round. The 5.56LLAx45 rounds can be fired one round at a time or fully automatic. This video demonstrates it in action …
In recent years rubber bullets have had a bad reputation in recent years leading to a numerous new less-lethal weapons, everything from fancy paintball guns to ray guns. I believe the reputation is underserved. When modern rubber bullets are correctly used the mortality rate is very low.
The company makes less lethal rounds in a number of modern calibers up to and including .50 BMG rounds for anti-piracy operations.
[ Many thanks to Lionel for the tip. ]