Charlie, I noticed the hand guard too. I'm thinking it might have been changed in an attempt to make it "correct." Tried to post earlier, but Windows 10 wants to have me look at "little blue circles" - that gets old. Will restart the thing or maybe just go to an older computer and post again later. The bolt on my 476K Inland is marked "O.I. 3" and my data sheet is checked off as it being a rounded lug - but not sure and have a question mark there. It's kind of pointed, too! The barrel is an undated Inland. Have another Inland 755K and the barrel is dated 7-43. For some reason, I have a note about the 26 coil hammer spring being "opposite" wound. I'll check into that later. I knew about the two types of buttplates being used, but had been advised on the site earlier that the hammer spring had been changed out. - Bob