What can cause a magazine box to "pinch" the action of a rifle?

The correct choice pertains to the stock inlet being too low. When the stock inlet is excessively low, it can lead to improper alignment of the magazine box and the action of the rifle. This misalignment can create a situation where the magazine box does not sit correctly within the stock, causing it to "pinch" the action as it interacts with the bolt or chamber during feeding or cycling.

This issue may hinder the smooth operation of the rifle, leading to feeding problems or even jams, which can affect overall reliability and performance. Ensuring that the stock inlet is properly shaped and sized is crucial for maintaining the correct alignment and function of the magazine and action components.

In contrast, high-quality ammunition typically contributes to better performance and reliability, and using parts from different manufacturers can lead to compatibility issues but not necessarily a pinching action. Over-tightening screws can contribute to a misalignment or binding effect but is not as directly related to the specific issue of the magazine box pinching the action as an incorrect stock inlet would be.