[mrerick]

A recent post about the profile of frame ears got me thinking about their variations in shape and profile.

Attached are photos of several Lugers form all production eras (which is why I posted this in General Discussions rather than one of the targeted forums).

There is considerable variation in the transition from te horizontal area that the toggle train rides along to the curved area that the toggle itself rides up to unlock the breech and permit extraction and ejection.

There is so much variation that I wonder if this small initial transition area was more a function of individual technician operation technique and the diameter of the milling tool rather than fixed jigs.

The position and curve of the long portion of the ear itself determines the timing of a Luger's cycle and must be precision cut. This must have been a function of jigs and subject to acceptance gauging in the factory.

Here are several Luger variations from DWM, Erfurt, W+F Switzerland, Simson, Mauser and Interarms/Mauser: