How much gap should exist between a Mauser magazine box and the floorplate?

The recommended gap between a Mauser magazine box and the floorplate is between .2mm and .5mm. This gap is important for several reasons related to the function and reliability of the magazine system. Specifically, maintaining this gap ensures that the magazine can feed ammunition smoothly into the chamber without obstruction. If the gap is too small, it may lead to binding, which can result in failure to feed or other malfunctions. Conversely, if the gap is too large, it may allow for excessive movement of the magazine components, potentially leading to misalignment during cycling.

Thus, the specified range of .2mm to .5mm strikes an optimal balance that supports smooth operation while maintaining structural integrity and alignment within the firearm. This precise measurement is essential to ensure consistent performance and reliability during use.