When it was first fielded the joke in the Navy was that CIWS stood for “Christ It Won’t Shoot.” It has gotten better since then.
Nothing like ripping rounds down range.
Popped a load of em down range yesterday from such far removed weapons as a 1882 vintage Winchester model 1873 and a 1943 vintage Garand. A 1944 vintage 1911A1 and a 1961 vintage Colt SAA.