Hey everyone been meaning to share my 1938 k98 with you all. It came with a vz24 front sight guard. I baught it from a local gun store in british columbia canada as part of an estate sale. It also came with a non matching bayonet!
The S is the serial suffix. Their numbering sequence was 1-9999, 1a-9999a etc etc
The LK5 I don’t think it truly known for fact yet. It was thoight to be a depot or something. I don’t see anything replaced on your gun, but I’m not well versed in reworked rifles.