 Through the application of electrothermal-chemical technology the XM291 has been able to achieve muzzle energy outputs that equate that to a low-level 140 mm gun, while achieving muzzle velocities greater than those of the larger 140 mm gun.Although the XM291 does not mean that ETC technology is viable it does offer an example that it is possible.ETC is also a more viable option than other alternatives by definition.