From what I know the only practical military application of coil guns would be artillery. It's quieter than conventional artillery and also produces no flash or smoke. Small arm coil guns seem hilariously inefficient unless you poison the round or something.

There's a coil shotgun on the market that has a muzzle energy of about 85 joules. For comparison an average pistol will be around 550 J. A 5.56mm rifle is around 1800 J.