The Ruger LC380 (Light Carry) handgun is chambered in .380ACP and is made for deep concealment or pocket carry, as is its predecessor, the Ruger LC9 in 9x19mm (introduced in 2011). A side-by-side comparison shows the two, the LC9 and the LC380, to be identical. From the accompanying insert to the owner’s manual: “…the Ruger LC380 has the same basic operational characteristics as the LC9 pistol.” This is correct – to a point.
Five changes were made to accommodate the new caliber: the slide, the barrel, a complete magazine and the pistol’s two recoil springs which I think (not having an LC9 on hand) are of lesser strength than that used for the 9x19mm cartridge. These parts are listed as factory installation only. (I also don’t foresee Ruger offering any sort of conversion service to change calibers from one to the other with either model.)