I seriously doubt that a barrel that short can toss a significant size shell at the speed of sound non the less multi mach. On top of that the coils around the barrel are very small to be able to create a significant gauss.
Propaganda methinks.
xactly.
Not a coil-gun.
At minimum,there are two parallel electrical rails.
https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1184&context=asen_gradetds