I'm pretty sure the weapons use a combination of E-zero magic and normal rail gun designs. I posted in an earlier post that they tried to observe how much recoil railguns produce and found none. But there's still controversy why that is etc etc.
Railgun recoil is just different from how a chemical / cartridge gun works. If you mount the power supply rigidly and just try to measure longitudinal force on the rails, you get a result of nearly nothing, because the force on the rails is mostly just away from each other, not back. The recoil should be most prevalent at the part closing the circuit of the rails opposite the armature.
Isn't that a little slow to cause such an explosion? I mean I don't know to what kind of bullet you're referring to but here's a 20mm anti-tank rifle:
I didn't draw that comparison, but it was actually a 20mm Oerlikon FFS. Projectile mass 122g, velocity 830m/s. Not my numbers, but that gets you about 100 kg m/s projectile momentum, recoil would also need to account for powder.





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