The real long eye-relief Weavers are the first two or three K series up through the K-60A. The K2.5, K2.5 60, and K2.5 60A had about 5" of eye relief and could be mounted ahead of unaltered bolt handles on 1903s and 1898 Mausers. The K3s of those series about the same. The K4s were perhaps .5 to .75" shorter in eye relief but if LOP was not overlong would still go ahead of a bolt handle. These early scopes did not have self centering reticles, which came in with the 60B series when the eye relief was drastically shortened. By that time the great wave of postwar sporterizing military rifles was ebbing, the techniques for bolt alteration were well understood, commercial rifles were adapted for scopes, and the long eye relief of the early Ks, Noskes and Lyman Alaskans was no longer needed.
