They are Nitrided inside and out.....Some Dumbass started that rumor!!!!!The whole barrel is Dipped or submerged in the salt bath which penetrates and case hardens the surface , It does not add to the surface like a coating or chrome lining!!!!!! Why would a company go to the trouble of plugging the barrel and only doing the outside. confused

“When you eliminate the impossible, whatever remains, however improbable, must be the truth.”