[1] During tests conducted in 2018, the M777 howitzer was able to double its range through the use of higher energy propellant and rocket-assisted projectiles, hitting targets over 37 miles (60 km) away.

[2] BAE Systems was given a $45 million contract in 2019 to incorporate the ERCA's cannon into a M109 chassis,[3] which was unveiled at that year's Association for the United States Army.

[4] Increased range and accuracy was accomplished by having a longer barrel, at 58 calibers long, and by using the XM1113 rocket-assisted artillery shell.

In 2020, the ERCA successfully hit a target 43 mi (69 km) away, which is over twice the range typically achieved by an M777 using the same round.

As designed, it was too large for the vehicle, so it was reduced to a 23-round capacity for better weight, center of gravity, and "onboard kills".