reply to post by GrOuNd_ZeRo
If the sound is from it breaking the sound barrier, a silencer won't help unless it slows the projectile down to subsonic speeds.
Anyway, the kind of "gauss rifle" the OP seems to be talking about is actually just a little toy showing off the ideas of magnetism and momentum
transfer. if you actually got it long enough to get the ball bearings to an appreciable speed, they'd shatter the magnets, which are made of a
brittle rare earth material.
a REAL Gauss rifle is composed of one or more electromagnets around a barrel. The strength of an electromagnet is dependent entirely on the current
through it. It will require a bank of capacitors, and a powerful, heavy power source if you plan on firing again in the foreseeable future.
No gauss rifle I know of can match the power, firing rate, and accuracy of a sporting rifle a tenth the weight and a fraction the cost. Quality
capacitors and any sort of SCRs are expensive, after all. copper wire and IR sensors and diodes are cheap, as can be the driving circuit and frame.
But there are a few components that drives the costs into the hundreds or thousands if you want it to pack more punch than a pellet gun.
Linear accelerators like Gauss rifles and rail guns are quite energy efficient. While a handgun can expect to produce 500 1000J at the muzzle from a
little bit of powder. To get the same performance out of a coilgun, you generally need to put in four to fifty times that much energy, and chances
are, you get that by burning fuel.
Vehicles have less of a problem because they already have engines, which, if they were made to handle linear accelerators, would come equipped with
quality alternators or generators in order to charge the capacitors for the gun. People aren't so lucky.
Railguns are quite different in structure and the specifics operation from coilguns, but their overall effect is similar. They're much easier to
build, but have many of their own problems that have proven difficult, such as rail erosion, and warping due to the stress that the magnetic field
puts on the rails. The navy is still trying to solve these problems so that they can use railguns on their ships.
Perhaps in the future, but linear accelerators are far from a worthwhile replacement for guns at the moment.