Object not showing up in render [UNSOLVED]

A couple nights ago, I modelled up a AR15 clip visualization. Usually I like to render my recent achievements and post them on a certain forum, however today I ran into a problem.
For a seemingly unknown reason, when I render the clip it doesn’t show up. All I want to show is the “clip” (the extra objects named “Plane.xxx” are parts of the actual AR15, which I have not finished and will continue modelling later). I have searched the top five results on Google.

m4a1.blend (667 KB)m4a1.blend (667 KB)

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