This "lil" rifle sports a 24" barrel that tapers down to a hair under 3\4" across the flats at the muzzle. It is around a 36 caliber with very good slow twist rifling. The overall length of this one is just 39 inches. Super light weight. There are no markings anywhere on the barrel or lock inside or out, so not real sure where in Europe it originates from. Not even sure of it's original purpose but as my subject line puts it it is now in the hands of an old kid!