sorry, i dont care what Nick says in his book..iv installed barrels marked RIA just under the front sight, Nick is a great guy, but like us, isnt perfect.
Rock Island did make or at least provide barrels made for the 1917.
matter fact, iv seen 1917 barrels FS on GB, and here on this site marked RIA. no...not 1903 barrels, i know the differance.