I love the transition from black to white in the background, that's the first thing that struck me. Two things bother me though, the arm in the foreground is the big one. At the elbow turning into the forearm... It just looks wrong, almost broken, it's too thick.
The second is very minuscule but I think it's just my personal preference. I think there should be smoke coming out of the chamber as the casing is ejected and also a smoke trail as the casing flies through the air
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