Weapons that fit the first category above are commonly called gadget guns; pen guns, stapler guns, cane guns, alarm clock guns, flashlight guns, the list of objects is pretty long. A few have been removed from the scope of the law because their collector status makes them unlikely to be misused; original Nazi belt buckle guns for example. See the C&R list for these.

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Trijicon ACOG TA648MGO-308: 6×48 with Red Chevron Reticle and Accessory M1913 Rail

The military’s need for a magnified, self-luminous tactical sight