Which of the following is NOT a factor that could cause ammunition to hang up in a tubular magazine?

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When considering what factors could lead to ammunition hanging up in a tubular magazine, understanding the physical interactions between the ammunition and the magazine is crucial. Humidity, while it can affect ammunition in various ways, is not a direct physical factor that typically causes ammunition to hang up. The primary concerns in such mechanisms usually revolve around dirt, dents, and rust.

Dirt can cause friction or blockage in the magazine, preventing the ammunition from feeding smoothly. Dents in the ammunition can alter the shape, making it difficult for rounds to stack properly or move freely. Rust, on the other hand, can deteriorate both the ammunition and the magazine itself, leading to malfunctions.

In contrast, humidity may affect the overall condition of the ammunition over time, such as causing corrosion or affecting the powder, but it does not create immediate, mechanical obstruction within the magazine itself, as the other options do. This distinction helps clarify why humidity stands out as the answer to the question.

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