Very high quality reproduction of the standard sights found on the M1 rifle throughout the war. These are really easy to install, so there's no excuse for having postwar T105 sights on your rifle. Simply unthread the old ones and slide these into place. A word of warning though, the bar on these needs to be snug, but do not use pliers or a spanner to tighten it, as this will lead to damage. We recommend periodically checking they are tight so you don't risk losing them. This is not a trait specific to these copies, originals suffered the same problem which is why they were replaced with the improved sight post war.