kragluver:  Yes, the downside of the micrometer versions of both the Redfield (#70K) and the Pacific (K2) sights is that there is no quick release to remove the slide from its base.  It is very tedious to rotate the vertical adjustment knob until its threads are fully clear of the base or the slide is at least high enough to remove the rifle bolt.  By the way, the Redfield and Pacific sights are entirely different. The "Western  Gunsight Company" was started by Redfield in 1909.  In the late 1920's Redfield renamed his company due to objections from the Western Cartridge Company.  Western and Redfield sights are identical.  This is probably what you were thinking about;  not a company purchase but a name change.