Another interesting point, when I bought my Lend Lease rifle years ago, I shot it over the years. There wasn't a warning or information about the
round firing pin. I had the 1947 ordnance manual which did state to replace the round firing pin - but no warning, it also said to replace the flush
nut rear sight and the short fork follower rod too. Much later Billy Pyle and Scott Duff published information about the round firing pin